publish.yaml

name: Create and publish a Docker image

on:
  push:
    branches: '[6-9].[0-9]'
env:
  REGISTRY: ghcr.io
  GHCR_IMAGE_NAME: 'exo-docker/exo-community'

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v3

      - name: Log in to the Container registry
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.SWF_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: metaghcr
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.REGISTRY }}/${{ env.GHCR_IMAGE_NAME }}
          flavor: |
            latest=false
            
      - name: Build and push Docker image to ghcr.io
        uses: docker/build-push-action@v4
        id: pushghcr
        with:
          context: .
          push: true
          tags: ${{ steps.metaghcr.outputs.tags }}
          labels: ${{ steps.metaghcr.outputs.labels }}

      - name: Install Cosign
        uses: sigstore/cosign-installer@v3.1.1
        
      - name: Write signing key to disk
        run: 'echo "$KEY" > cosign.key'
        env:
          KEY: ${{ secrets.COSIGN_PRIVATE_KEY }}
      
      - name: Sign the published ghcr.io Docker image
        run: cosign sign --yes --key cosign.key "${TAGS}@${DIGEST}"
        env:
          COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}
          DIGEST: ${{ steps.pushghcr.outputs.digest }}
          TAGS: ${{ steps.metaghcr.outputs.tags }}