docker-image-publish.yml

name: Docker Publish ghcr.io

on:
  schedule:
    - cron: '30 14 * * *'
  push:
    branches: [ "main" ]
    tags: [ 'v*.*.*' ]
  pull_request:
    branches: [ "main" ]

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  setup-buildx:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
        with:
          install: true

  build-and-push:
    runs-on: ubuntu-latest
    needs: setup-buildx
    permissions:
      contents: read
      packages: write
      id-token: write
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
        with:
          install: true

      - name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      - name: Set lowercased image name
        id: image_name_lowercase
        run: echo "IMAGE_NAME_LOWER=$(echo ${{ env.IMAGE_NAME }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV

      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@v2
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name != 'pull_request' }}
          tags: |
            ${{ steps.meta.outputs.tags }}
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LOWER }}:latest
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Install cosign
        if: github.event_name != 'pull_request'
        run: |
          curl -sSL https://github.com/sigstore/cosign/releases/download/v2.2.4/cosign-linux-amd64 > /usr/local/bin/cosign
          chmod +x /usr/local/bin/cosign

      - name: Sign the published Docker image
        if: github.event_name != 'pull_request'
        env:
          TAGS: ${{ steps.meta.outputs.tags }}
          DIGEST: ${{ steps.build-and-push.outputs.digest }}
        run: |
          echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}