build-docker-app.yml

name: Build and Push Docker App Toolbox
on:
  schedule:
    - cron: '20 22 * * *'  # 10:20pm everyday
  pull_request:
  merge_group:
  workflow_dispatch:
env:
    IMAGE_NAME: docker-distrobox
    IMAGE_TAGS: latest
    IMAGE_REGISTRY: ghcr.io/${{ github.repository_owner }}

concurrency:
  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
  cancel-in-progress: true

jobs:
  push-ghcr:
    name: Build and push image
    runs-on: ubuntu-22.04
    permissions:
      contents: read
      packages: write
      id-token: write
    strategy:
      fail-fast: false
    steps:
      # Checkout push-to-registry action GitHub repository
      - name: Checkout Push to Registry action
        uses: actions/checkout@v4

      - name: Verify Ublue-OS Ubuntu toolbox
        uses: EyeCantCU/cosign-action/verify@v0.3.0
        with:
          containers: ubuntu-toolbox:latest
          pubkey: https://raw.githubusercontent.com/ublue-os/toolboxes/main/cosign.pub
          registry: ghcr.io/ublue-os

      # Workaround bug where capital letters in your GitHub username make it impossible to push to GHCR.
      # https://github.com/macbre/push-to-ghcr/issues/12
      - name: Lowercase Registry
        id: registry_case
        uses: ASzc/change-string-case-action@v6
        with:
          string: ${{ env.IMAGE_REGISTRY }}

      # Build metadata
      - name: Image Metadata
        uses: docker/metadata-action@v5
        id: meta
        with:
          images: |
            ${{ steps.registry_case.outputs.lowercase }}/${{ env.IMAGE_NAME }}
          labels: |
            io.artifacthub.package.readme-url=https://raw.githubusercontent.com/ublue-os/boxkit/main/README.md
          tags: |
            ${{ env.IMAGE_TAGS }}

      # Login to Contaier Registry if not a PR
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        if: github.event_name != 'pull_request'
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Build and Push Image
      - name: Build and Push Image
        id: build_image
        uses: docker/build-push-action@v6
        with:
          push: ${{ github.event_name != 'pull_request' }}
          file: ./apps/docker/Containerfile.docker
          labels: ${{ steps.meta.outputs.labels }}
          tags: ${{  steps.meta.outputs.tags  }}

      # Sign container
      - uses: sigstore/cosign-installer@v3.7.0
        if: github.event_name != 'pull_request'

      - name: Sign container image
        if: github.event_name != 'pull_request'
        run: |
          echo "${{ env.COSIGN_PRIVATE_KEY }}" > cosign.key
          wc -c cosign.key
          cosign sign -y --key cosign.key ${{ steps.registry_case.outputs.lowercase }}/${{ env.IMAGE_NAME }}@${TAGS}
        env:
          TAGS: ${{ steps.build_image.outputs.digest }}
          COSIGN_EXPERIMENTAL: false
          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}

      - name: Echo outputs
        run: |
          echo "${{ toJSON(steps.build_image.outputs) }}"