docker-ghcr.yml

name: Publish Docker Image on GHCR - GitHub Container Registry

# This workflow uses actions that are not certified by GitHub.
# They are provided by a third-party and are governed by
# separate terms of service, privacy policy, and support
# documentation.

on:
#  schedule:
#    - cron: '24 21 * * *'
  push:
    branches: [ "rising" ]
    tags: [ 'v*.*.*' ]
  pull_request:
    branches: [ "rising" ]

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}
  IMAGE_BASE_NAME: fluidos-energy-predictor
  ORG_NAME: risingfbk
  BASE_BRANCH: rising


jobs:
  build:

    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      # This is used to complete the identity challenge
      # with sigstore/fulcio when running outside of PRs.
      id-token: write

    steps:
      - name: Check out the repo
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          fetch-tags: true 

      - name: Set running Git tag
        run: echo "GIT_TAG=$(git describe --tags --always)" >> $GITHUB_ENV

      - name: Set last version Git tag
        run: echo "VERSION=$(git describe --tags --always --abbrev=0)" >> $GITHUB_ENV

      # Install the cosign tool except on PR
      # https://github.com/sigstore/cosign-installer
      - name: Install cosign
        if: github.event_name != 'pull_request'
        uses: sigstore/cosign-installer@6e04d228eb30da1757ee4e1dd75a0ec73a653e06 #v3.1.1
        with:
          cosign-release: 'v2.1.1'

      # Workaround: https://github.com/docker/build-push-action/issues/461
      - name: Setup Docker buildx
        uses: docker/setup-buildx-action@79abd3f86f79a9d68a23c75a09a9a85889262adf

      # Login against a Docker registry except on PR
      # https://github.com/docker/login-action
      - name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Extract metadata (tags, labels) for Docker
      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      # Build and push Docker image with Buildx (don't push on PR)
      # https://github.com/docker/build-push-action
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.BASE_BRANCH }} , ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.GIT_TAG }} , ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.VERSION }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max


      # Sign the resulting Docker image digest except on PRs.
      # This will only write to the public Rekor transparency log when the Docker
      # repository is public to avoid leaking data.  If you would like to publish
      # transparency data even for private images, pass --force to cosign below.
      # https://github.com/sigstore/cosign
      # - name: Sign the published Docker image
      #  if: ${{ github.event_name != 'pull_request' }}
      #  env:
          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
          #    TAGS: ${{ steps.meta.outputs.tags }}
          #DIGEST: ${{ steps.build-and-push.outputs.digest }}
        # This step uses the identity token to provision an ephemeral certificate
        # against the sigstore community Fulcio instance.
        #run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}

  clean:
    name: Clean up unused images
    needs: build
    runs-on: ubuntu-latest
    steps:
      - name: Delete non-release images 
        uses: snok/container-retention-policy@v2
        with:
          image-names: ${{ env.IMAGE_BASE_NAME }}
          cut-off: 20 minutes ago UTC
          account-type: org
          org-name: ${{ env.ORG_NAME }}
          keep-at-least: 3
          skip-tags: ${{ env.BASE_BRANCH }} , ${{ env.VERSION }}
          token: ${{ secrets.GITHUB_TOKEN }}
          token-type: github-token