Fix preview branch build and enable automation

.github/dependabot.yaml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      # Check for updates to GitHub Actions every month
+      interval: "monthly"

.github/workflows/promote-to-stable.yml

@@ -0,0 +1,27 @@
+name: Promote to `preview/stable`
+
+on:
+  issue_comment:
+    types:
+      - created
+
+permissions:
+  issues: write
+
+jobs:
+  promote:
+    name: ⬆️ Promote to preview/stable
+    environment: "Preview Candidate Branch"
+    runs-on: ubuntu-latest
+    if: |
+      ( !github.event.issue.pull_request )
+      && contains(github.event.comment.body, '/promote ')
+      && contains(github.event.comment.body, 'preview/stable')
+      && contains(github.event.*.labels.*.name, 'testing')
+    steps:
+      - name: ⬆️ Promote to preview/stable
+        uses: snapcrafters/ci/promote-to-stable@main
+        with:
+          channel: preview/stable
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          store-token: ${{ secrets.SNAP_STORE_STABLE }}

.github/workflows/pull-request.yml

@@ -0,0 +1,18 @@
+name: Pull Request
+
+on:
+  pull_request:
+    branches: ["preview/candidate"]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: 🧪 Build snap on amd64
+    runs-on: self-hosted
+    timeout-minutes: 1440
+    steps:
+      - name: 🧪 Build snap on amd64
+        uses: snapcrafters/ci/test-snap-build@main

.github/workflows/release-to-candidate.yaml

@@ -0,0 +1,77 @@
+name: Release
+
+on:
+  # Run the workflow each time new commits are pushed to the candidate branch.
+  push:
+    branches: ["preview/candidate"]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+  issues: write
+
+jobs:
+  get-architectures:
+    name: 🖥 Get snap architectures
+    runs-on: ubuntu-latest
+    outputs:
+      architectures: ${{ steps.get-architectures.outputs.architectures }}
+      architectures-list: ${{ steps.get-architectures.outputs.architectures-list }}
+    steps:
+      - name: 🖥 Get snap architectures
+        id: get-architectures
+        uses: snapcrafters/ci/get-architectures@main
+
+  release:
+    name: 🚢 Release to preview/candidate
+    needs: get-architectures
+    runs-on: self-hosted
+    timeout-minutes: 1440
+    environment: "Preview Candidate Branch"
+    strategy:
+      matrix:
+        architecture: ${{ fromJSON(needs.get-architectures.outputs.architectures-list) }}
+    steps:
+      - name: 🚢 Release to preview/candidate
+        uses: snapcrafters/ci/release-to-candidate@main
+        with:
+          architecture: ${{ matrix.architecture }}
+          channel: preview/candidate
+          launchpad-token: ${{ secrets.LP_BUILD_SECRET }}
+          repo-token: ${{ secrets.SNAPCRAFTERS_BOT_COMMIT }}
+          store-token: ${{ secrets.SNAP_STORE_CANDIDATE }}
+
+  call-for-testing:
+    name: 📣 Create call for testing
+    needs: [release, get-architectures]
+    environment: "Preview Candidate Branch"
+    runs-on: ubuntu-latest
+    outputs:
+      issue-number: ${{ steps.issue.outputs.issue-number }}
+    steps:
+      - name: 📣 Create call for testing
+        id: issue
+        uses: snapcrafters/ci/call-for-testing@main
+        with:
+          architectures: ${{ needs.get-architectures.outputs.architectures }}
+          channel: preview/candidate
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          promotion-channel: preview/stable
+
+  screenshots:
+    name: 📸 Gather screenshots
+    needs: call-for-testing
+    environment: "Preview Candidate Branch"
+    runs-on: self-hosted
+    steps:
+      - name: 📸 Gather screenshots
+        uses: snapcrafters/ci/get-screenshots@main
+        with:
+          channel: preview/candidate
+          issue-number: ${{ needs.call-for-testing.outputs.issue-number }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          screenshots-token: ${{ secrets.SNAPCRAFTERS_BOT_COMMIT }}

.github/workflows/sync-version-with-upstream.yml

@@ -0,0 +1,28 @@
+name: Update preview
+
+on:
+  # Runs at 10:00 UTC every day
+  schedule:
+    - cron:  '0 10 * * *'
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  sync:
+    name: 🔄 Sync version with upstream
+    environment: "Preview Candidate Branch"
+    runs-on: ubuntu-latest
+    steps:
+      - name: 🔄 Sync version with upstream
+        uses: snapcrafters/ci/sync-version@main
+        with:
+          branch: preview/candidate
+          token: ${{ secrets.SNAPCRAFTERS_BOT_COMMIT }}
+          update-script: |
+            VERSION=$(curl -s https://www.gimp.org/downloads/devel/ | grep -Po "The current development release of GIMP is <b>\K[^<]+")
+            sed -i 's/^\(version: \).*$/\1'"$VERSION"'/' snap/snapcraft.yaml
+

.gitignore

@@ -7,4 +7,7 @@ prime
 __pycache__
 *.pyc
 
-.bzr
+.bzr
+
+# Snapcraft remote-build logs
+gimp_*.txt

README.md

@@ -8,65 +8,80 @@
 distributions.</p>
 
 <p align="center">
-<a href="https://build.snapcraft.io/user/snapcrafters/gimp"><img src="https://build.snapcraft.io/badge/snapcrafters/gimp.svg" alt="Snap Status"></a>
+<a href="https://snapcraft.io/gimp"><img src="https://snapcraft.io/gimp/badge.svg" alt="Snap Status"></a>
+<a href="https://github.com/snapcrafters/gimp/actions/workflows/sync-version-with-upstream.yml"><img src="https://github.com/snapcrafters/gimp/actions/workflows/sync-version-with-upstream.yml/badge.svg"></a>
+<a href="https://github.com/snapcrafters/gimp/actions/workflows/release-to-candidate.yaml"><img src="https://github.com/snapcrafters/gimp/actions/workflows/release-to-candidate.yaml/badge.svg"></a>
+<a href="https://github.com/snapcrafters/gimp/actions/workflows/promote-to-stable.yml"><img src="https://github.com/snapcrafters/gimp/actions/workflows/promote-to-stable.yml/badge.svg"></a>
 </p>
 
 ## Install
 
-    sudo snap install gimp
+```shell
+snap install gimp --channel preview/stable
+```
 
 ([Don't have snapd installed?](https://snapcraft.io/docs/core/install))
 
-![GIMP](screenshot.png?raw=true "GIMP")
-
 <p align="center">Published for <img src="https://raw.githubusercontent.com/anythingcodes/slack-emoji-for-techies/gh-pages/emoji/tux.png" align="top" width="24" /> with :gift_heart: by Snapcrafters</p>
 
-## Remaining tasks
-
-Snapcrafters ([join us](https://forum.snapcraft.io/t/join-snapcrafters/1325)) 
-are working to land snap install documentation and
-the [snapcraft.yaml](https://github.com/snapcrafters/fork-and-rename-me/blob/master/snap/snapcraft.yaml)
-upstream so GIMP can authoritatively publish future releases.
-
-  - [x] Fork the [Snapcrafters template](https://github.com/snapcrafters/fork-and-rename-me) repository to your own GitHub account.
-    - If you have already forked the Snapcrafter template to your account and want to create another snap, you'll need to use GitHub's [Import repository](https://github.com/new/import) feature because you can only fork a repository once.
-  - [x] Rename the forked Snapcrafters template repository
-  - [x] Update logos and references to `[Project]` and `[my-snap-name]`
-  - [x] Create a snap that runs in `devmode`
-  - [x] Register the snap in the store, **using the preferred upstream name**
-  - [x] Add a screenshot to this `README.md`
-  - [x] Publish the `devmode` snap in the Snap store edge channel
-  - [x] Add install instructions to this `README.md`
-  - [x] Update snap store metadata, icons and screenshots
-  - [x] Convert the snap to `strict` confinement, or `classic` confinement if it qualifies
-  - [x] Publish the confined snap in the Snap store beta channel
-  - [x] Update the install instructions in this `README.md`
-  - [x] Post a call for testing on the [Snapcraft Forum](https://forum.snapcraft.io) - [link](https://forum.snapcraft.io/t/call-for-testing-gimp/1281)
-  - [x] Ask a [Snapcrafters admin](https://github.com/orgs/snapcrafters/people?query=%20role%3Aowner) to fork your repo into github.com/snapcrafters, transfer the snap name from you to snapcrafters, and configure the repo for automatic publishing into edge on commit
-  - [x] Add the provided Snapcraft build badge to this `README.md`
-  - [x] Publish the snap in the Snap store stable channel
-  - [x] Update the install instructions in this `README.md`
-  - [x] Post an announcement in the [Snapcraft Forum](https://forum.snapcraft.io) - [link](https://forum.snapcraft.io/t/gimp-snap-pushed-to-stable-channel/1619)
-  - [ ] Submit a pull request or patch upstream that adds snap install documentation - [link]()
-  - [ ] Submit a pull request or patch upstream that adds the `snapcraft.yaml` and any required assets/launchers - [link]()
-  - [ ] Add upstream contact information to the `README.md`
-  - If upstream accept the PR:
-    - [ ] Request upstream create a Snap store account
-    - [ ] Contact the Snap Advocacy team to request the snap be transferred to upstream
-  - [ ] Ask the Snap Advocacy team to celebrate the snap - [link]()
-
-If you have any questions, [post in the Snapcraft forum](https://forum.snapcraft.io).
-
-## The Snapcrafters
-
-| [![Dani Llewellyn](https://gravatar.com/avatar/c77d9922c44ee0a34b8cabc4029b5082/?s=128)](https://github.com/diddledani/) |
-| :---: |
-| [Dani Llewellyn](https://github.com/diddledani/) |
-
-<!-- Uncomment and modify this when you have upstream contacts
-## Upstream
-
-| [![Upstream Name](http://gravatar.com/avatar/bc0bced65e963eb5c3a16cab8b004431?s=128)](https://github.com/upstreamname) |
-| :---: |
-| [Upstream Name](https://github.com/upstreamname) |
--->
+## How to contribute to this snap
+
+Thanks for your interest! Below you find instructions to help you contribute to this snap.
+
+The general workflow is to submit pull requests that merges your changes into the `candidate` branch here on GitHub. Once the pull request has been merged, a GitHub action will automatically build the snap and publish it to the `candidate` channel in the Snap Store. Once the snap has been tested thoroughly, we promote it to the `stable` channel so all our users get it!
+
+### Initial setup
+
+If this is your first time contributing to this snap, you first need to set up your own fork of this repository.
+
+1. [Fork the repository](https://docs.github.com/en/github/getting-started-with-github/fork-a-repo) into your own GitHub namespace.
+2. [Clone your fork](https://git-scm.com/book/en/v2/Git-Basics-Getting-a-Git-Repository), so that you have it on your local computer.
+3. Configure your local repo. To make things a bit more intuitive, we will rename your fork's remote to `myfork`, and add the snapcrafters repo as `snapcrafters`.
+
+    ```shell
+    git remote rename origin myfork
+    git remote add snapcrafters https://github.com/snapcrafters/gimp.git
+    git fetch --all
+    ```
+
+### Submitting changes in a pull request
+
+Once you're all setup for contributing, keep in mind that you want the git information to be all up-to-date. So if you haven't "fetched" all changes in a while, start with that:
+
+```shell
+git fetch --all -p
+```
+
+Now that your git metadata has been updated you are ready to create a bugfix branch, make your changes, and open a pull request.
+
+1. All pull requests should go to the stable branch so create your branch as a copy of the stable branch:
+
+    ```shell
+    git checkout -b my-bugfix-branch snapcrafters/candidate
+    ```
+
+2. Make your desired changes and build a snap locally for testing:
+
+    ```shell
+    snapcraft --use-lxd
+    ```
+
+3. After you are happy with your changes, commit them and push them to your fork so they are available on GitHub:
+
+    ```shell
+    git commit -a
+    git push -u myfork my-bugfix-branch
+    ```
+
+4. Then, [open up a pull request](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/about-pull-requests) from your `my-bugfix-branch` to the `snapcrafters/candidate` branch.
+5. Once you've opened the pull request, it will automatically trigger the build-test action that will launch a build of the snap. You can watch the progress of the snap build from your pull request (Show all checks -> Details). Once the snap build has completed, you can find the built snap (to test with) under "Artifacts".
+6. Someone from the team will review the open pull request and either merge it or start a discussion with you with additional changes or clarification needed.
+7. Once the pull request has been merged into the stable branch, a GitHub action will rebuild the snap using your changes and publish it to the [Snap Store](https://snapcraft.io/gimp) into the `candidate` channel. After sufficient testing of the snap from the candidate channel, one of the maintainers or administrators will promote the snap to the stable branch in the Snap Store.
+
+## Maintainers
+
+-   [@lucyllewy](https://github.com/lucyllewy/)
+
+## License
+
+-   The license of both the build files in this repository is [MIT](https://github.com/snapcrafters/gimp/blob/main/LICENSE)