Add GitHub workflow for releases (#58)

Adds a new GitHub workflow for releases that will:

- Upload the CRDs and default CR manifest
- Build and push the docker image

Closes https://linear.app/prefect/issue/PLA-220/design-release-process

Closes #18

.github/release.yaml

@@ -0,0 +1,28 @@
+# .github/release.yml
+
+changelog:
+  exclude:
+    labels:
+      - maintenance
+  categories:
+    - title: Breaking Changes
+      labels:
+        - breaking
+    - title: Dependency Updates
+      labels:
+        - dependencies
+    - title: Documentation
+      labels:
+        - docs
+    - title: Enhancements
+      labels:
+        - enhancement
+    - title: Exciting New Features 🎉
+      labels:
+        - feature
+    - title: Fixes
+      labels:
+        - fix
+    - title: Uncategorized
+      labels:
+        - "*"

.github/workflows/release.yaml

@@ -0,0 +1,102 @@
+# Prefect Operator release workflow.
+name: Release
+
+"on":
+  push:
+    branches:
+      - main
+    tags:
+      - '*'
+  pull_request:
+    branches:
+      - main
+
+permissions: {}
+
+jobs:
+  unit-tests:
+    name: Unit tests
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Install tool dependencies
+        uses: jdx/mise-action@v2
+
+      - name: Build
+        run: make build
+
+      - name: Test
+        run: make test
+
+  build-and-upload-manifests:
+    needs: unit-tests
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Install tool dependencies
+        uses: jdx/mise-action@v2
+
+      - name: Build manifests
+        run: |
+          (cd config/manager && kustomize edit set image controller=prefecthq/prefect-operator:${{ github.ref_name }})
+          kustomize build config/crd > prefect-crds.yaml
+          kustomize build config/default > prefect.yaml
+
+      - name: Upload release assets
+        if: github.ref_type == 'tag'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: gh release upload ${{ github.ref_name }} prefect-crds.yaml prefect.yaml
+
+  build-and-push-docker-image:
+    needs: unit-tests
+    runs-on: ubuntu-latest
+    # The GitHub environments are created by Terraform and map to Docker Hub repositories:
+    # - dev: https://hub.docker.com/r/prefecthq/prefect-operator-dev
+    # - prod: https://hub.docker.com/r/prefecthq/prefect-operator
+    # The environment will be 'prod' if the GitHub event is a release. Otherwise, it will be 'dev'.
+    environment: ${{ github.event_name == 'release' && 'prod' || 'dev' }}
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          # These credentials are managed in Terraform. Depending on the 'environment' value above,
+          # these will either be the credentials for 'dev' or 'prod'.
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Docker image metadata
+        id: metadata
+        uses: docker/metadata-action@v5
+        with:
+          images: prefecthq/prefect-operator${{ github.event_name == 'pull_request' && '-dev' }}
+          tags: |
+            type=ref,event=pr
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+          labels: |
+            org.opencontainers.image.title=prefect-operator
+            org.opencontainers.image.description=Prefect Operator image
+            org.opencontainers.image.vendor=Prefect
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.metadata.outputs.tags }}
+          labels: ${{ steps.metadata.outputs.labels }}

.mise.toml

@@ -1,8 +1,10 @@
 [tools]
+actionlint = '1.7.1'
 ginkgo = '2.19.0'
 golang = '1.21'
 golangci-lint = '1.57.2'
 kube-controller-tools = '0.14.0'
 kubectl = '1.31'
 kustomize = '5.3.0'
 setup-envtest = '0.17.0'
+yamllint = '1.35.1'

.pre-commit-config.yaml

@@ -0,0 +1,26 @@
+---
+fail_fast: false
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.3.0
+    hooks:
+      - id: check-merge-conflict
+      - id: check-yaml
+        args:
+          - --allow-multiple-documents
+      - id: detect-private-key
+      - id: no-commit-to-branch
+      - id: trailing-whitespace
+
+  - repo: https://github.com/adrienverge/yamllint.git
+    rev: v1.28.0
+    hooks:
+      - id: yamllint
+        args:
+          - --strict
+
+  - repo: https://github.com/rhysd/actionlint
+    rev: v1.7.1
+    hooks:
+      - id: actionlint

.yamllint

@@ -0,0 +1,12 @@
+---
+extends: default
+
+ignore: |
+  config/
+
+rules:
+  comments:
+    min-spaces-from-content: 1
+  comments-indentation: disable
+  document-start: disable
+  line-length: disable