tag.yaml

name: Build and Push Docker Image

on:
  push:
    tags:
      - '*'

env:
  IMAGE_NAME: octostar/app.my-app
  CACHE_NAME: octostar/cache:app.my-app

jobs:

  docker-build:
    name: docker-build
    runs-on: ${{ matrix.runner_platform.runner }}
    strategy:
      matrix:
        runner_platform: [ { runner: linux_150gb_runner, platform: linux/amd64, architecture: amd64 }, { runner: github_linux_arm64, platform: linux/arm64, architecture: arm64 } ]

    steps:
      - name: "Checkout ${{ github.ref }} ( ${{ github.sha }} )"
        uses: actions/checkout@v4
        with:
          persist-credentials: false
          fetch-depth: 0

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Build and push Docker Image
        id: docker_build
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: ${{ matrix.runner_platform.platform }}
          cache-from: type=registry,ref=${{ env.CACHE_NAME }}-${{ matrix.runner_platform.architecture }}
          cache-to: type=registry,ref=${{ env.CACHE_NAME }}-${{ matrix.runner_platform.architecture }}
          push: true
          outputs: type=image,name=${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=true


      - name: Export digest
        run: |
          mkdir -p /tmp/digests/${{ matrix.runner_platform.architecture }}/
          digest="${{ steps.docker_build.outputs.digest }}"
          touch "/tmp/digests/${{ matrix.runner_platform.architecture }}/${digest#sha256:}"

      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ matrix.runner_platform.architecture }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge_docker_images:
    needs: [ docker-build ]
    runs-on: ubuntu-latest
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Create manifest list for ${{ env.IMAGE_NAME }} and push
        working-directory: /tmp/digests
        run: |
          digest_amd64=$(ls amd64)
          digest_arm64=$(ls arm64)
          docker buildx imagetools create \
          --tag ${{ env.IMAGE_NAME }}:latest \
          --tag ${{ env.IMAGE_NAME }}:${{ github.ref_name }} \
          ${{ env.IMAGE_NAME }}@sha256:${digest_amd64} \
          ${{ env.IMAGE_NAME }}@sha256:${digest_arm64}

      - name: Display Docker Image Tag
        run: "echo Docker Image Tag: ${{ env.IMAGE_NAME }}:${{ github.ref_name }}"