release-image.yaml

name: Release image
on:
  push:
    tags:
      - v*
  workflow_dispatch:
jobs:
  build:
    name: Publish image
    runs-on: ubuntu-latest
    env:
      IMG_NAME: pod-graceful-drain
    steps:
      - uses: actions/checkout@v4
      - uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN  }}
      - run: |
          docker build --file docker/build.Dockerfile \
            --tag "$IMG_NAME:latest" \
            .
      - name: Tag and push
        run: |
          GIT_VERSION=$(git describe --tags --dirty --always)
          REGISTRY=ghcr.io/${{ github.repository_owner }}

          tag-and-push() { docker tag $1 $2 && docker push $2; }

          tag-and-push $IMG_NAME:latest $REGISTRY/$IMG_NAME:$GIT_VERSION

          LATEST_TAG="$(git describe --tags --dirty --always --abbrev=0)"
          if git diff --quiet "$LATEST_TAG"; then
            tag-and-push $IMG_NAME:latest $REGISTRY/$IMG_NAME:latest
          fi