docker-image-push.yml

name: Build and push multi-arch Docker image

on:
  schedule:
    - cron: '0 9 * * FRI'
  release:
    types: [published]
  workflow_dispatch:
    inputs:
      tag:
        type: string
        description: Which tag to rebuild and push.
        required: true

permissions:
  contents: read
  packages: write

jobs:
  build:
    name: Build
    # We want a newer version of qemu: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1815100
    runs-on: ubuntu-20.04
    strategy:
      fail-fast: false
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Checkout latest stable release
        if: ${{ github.event_name == 'schedule' }}
        run: git checkout "$(git tag -l | grep -E "^[0-9]*\.[0-9]*\.[0-9]*$" | tail -n 1)"

      - name: Checkout provided tag
        if: ${{ inputs.tag }}
        run: git checkout "${{ inputs.tag }}"

      - name: Docker login
        env:
          DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
          DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
        run: echo "${DOCKER_PASSWORD}" | docker login -u "${DOCKER_USERNAME}" --password-stdin docker.io

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v3
        with:
          install: true

      - name: Log in to ghcr.io
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build Docker image
        env:
          PLATFORMS: linux/amd64,linux/arm64/v8,linux/arm/v7
        run: |
          set -euxo pipefail

          VERSION="$(git describe --exact-match --tags HEAD)"
          TAG="$VERSION"
          MAJOR_TAG="$(sed -nre 's/^([0-9]+).*/\1/p' <<< "$VERSION")"
          DOCKERHUB_IMAGE="thelounge/thelounge"
          GITHUB_IMAGE="ghcr.io/thelounge/thelounge"
          TAGS=(
              "--tag" "${DOCKERHUB_IMAGE}:${TAG}"
              "--tag" "${GITHUB_IMAGE}:${TAG}"
          )

          # If not a pre-release push :latest & MAJOR_TAG
          if grep -qE "^[0-9]*\.[0-9]*\.[0-9]*$" <<< "${VERSION}"; then
              TAGS+=(
                  "--tag" "${DOCKERHUB_IMAGE}:latest"
                  "--tag" "${DOCKERHUB_IMAGE}:${MAJOR_TAG}"
                  "--tag" "${GITHUB_IMAGE}:latest"
                  "--tag" "${GITHUB_IMAGE}:${MAJOR_TAG}"
              )
          fi

          docker buildx build \
              --label org.opencontainers.artifact.created="$(date --rfc-3339=seconds --utc)" \
              --push \
              --platform "${PLATFORMS}" \
              "${TAGS[@]}" \
              --file Dockerfile \
              .