release.yaml

name: Build and Publish the mailserver Docker Image to GHCR.io

# Manually-triggered action to build the latest version (or optionally, if provided, a release tag)
#   of mailserver.

on:
  workflow_dispatch:
    inputs:
      version_tag:
        description: Optional version tag to build. Defaults to latest main.
        required: false
      tag_as_latest:
        description: Also tag image as latest (in addition to tag supplied / computed).
        type: boolean
        default: 0

jobs:
  build_and_publish_image:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          path: mailserver
          fetch-depth: 0

      - name: Optionally Check Out Tag
        if: ${{ inputs.version_tag }}
        # work around https://github.com/actions/runner/issues/665
        shell: bash
        env:
          VERSION_TAG: ${{ inputs.version_tag }}
        run: |
          cd mailserver
          git checkout "mailserver-$VERSION_TAG"

      - name: Grok image tag
        run: |
          cd mailserver
          git describe --tags | tee SRC_TAG
          echo "ghcr.io/t-lo/mailserver:$(cat SRC_TAG)" | tee IMAGE_TAG

      - name: Build the docker image
        run: |
          cd mailserver
          tag=$(cat IMAGE_TAG)
          docker build -t "$(cat IMAGE_TAG)" .

      - name: Login to GHCR
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Push Image
        run: |
          docker push "$(cat mailserver/IMAGE_TAG)"

      - name: Optionally Tag Image as Latest
        if: ${{ inputs.tag_as_latest }}
        run: |
          docker tag "$(cat mailserver/IMAGE_TAG)" ghcr.io/t-lo/mailserver:latest
          docker push ghcr.io/t-lo/mailserver:latest