build.yml

name: Publish Docker image

on:
  release:
    types: [published]
  push:
    branches: ["main"]
    paths:
        - 'Dockerfile'
        - 'backend/**'
        - 'database-docker/**'
        - 'web-server/**'
        - 'setup_utils/**'
  workflow_dispatch:

env:
  REGISTRY_IMAGE: middlewareeng/middleware
  AWS_REGION: ap-south-1
  RUNNER_SUBNET: subnet-0551adcc31939391b
  RUNNER_SG: sg-0805fa13c0f7f6e2c

jobs:

  start-runner-arm:
    name: Start self-hosted ARM EC2 runner
    runs-on: ubuntu-latest
    outputs:
      label: ${{ steps.start-ec2-runner.outputs.label }}
      ec2-instance-id: ${{ steps.start-ec2-runner.outputs.ec2-instance-id }}
    steps:
      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v1
        with:
          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          aws-region: ${{ env.AWS_REGION }}

      - name: Start EC2 runner arm
        id: start-ec2-runner
        uses: machulav/ec2-github-runner@v2
        with:
          mode: start
          github-token: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}
          ec2-image-id: ami-07c3226e40486ca7f
          ec2-instance-type: t4g.medium
          subnet-id: ${{ env.RUNNER_SUBNET }}
          security-group-id: ${{ env.RUNNER_SG }}
          aws-resource-tags: >
            [
              {"Key": "Name", "Value": "ec2-github-runner-arm64"},
              {"Key": "GitHubRepository", "Value": "${{ github.repository }}"}
            ]

  build:
    name: Build and Push Docker Image
    needs: start-runner-arm
    runs-on: ${{ matrix.runner }}
    strategy:
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
          - platform: linux/arm64
            runner: ${{ needs.start-runner-arm.outputs.label }}

    steps:
      - name: Prepare
        run: |
          platform=${{ matrix.platform }}
          BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ')
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
          echo "BUILD_DATE=${BUILD_DATE}" >> $GITHUB_ENV

      - name: Checkout
        uses: actions/checkout@v4
        with:
          ref: ${{ github.ref }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY_IMAGE }}
          labels: |
            org.opencontainers.image.source=${{ github.event.repository.clone_url }}
            org.opencontainers.image.created=${{ steps.meta.outputs.created }}
            org.opencontainers.image.revision=${{ github.sha }}
            org.opencontainers.image.licenses=${{ fromJson('["MIT"]') }}
          flavor: |
            latest=auto

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

      - 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: Print build metadata
        run: echo "${{ toJson(steps.meta.outputs) }}"

      - name: Build and push Docker image by digest
        id: build
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ./Dockerfile
          platforms: ${{ matrix.platform }}
          build-args: |
            BUILD_DATE=${{ env.BUILD_DATE }}
            MERGE_COMMIT_SHA=${{ github.sha }}
          tags: ${{ github.ref == 'refs/heads/main' && format('middlewareeng/middleware:latest') || steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=false,name-canonical=true,push=true

      - name: Print build output
        run: echo "${{ toJson(steps.build.outputs) }}"

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


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

      - name: delete local temp digest
        run: |
          rm -rf /tmp/digests
  merge:
    runs-on: ubuntu-latest
    needs:
      - build
    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: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY_IMAGE }}

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

      - name: Create tag for new image
        id: tag
        run: |
          if [ "${{ github.ref }}" == "refs/heads/main" ]; then
            echo "DOCKER_TAG=-t middlewareeng/middleware:latest"
            echo "DOCKER_TAG=-t middlewareeng/middleware:latest" >> $GITHUB_ENV
          else
            echo "AUTOMATIC TAG"
            echo "DOCKER_TAG=$(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON")" >> $GITHUB_ENV
          fi

      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create ${{ env.DOCKER_TAG }} \
            $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)

  stop-runner-arm:
    name: Stop self-hosted EC2 arm runner
    needs:
      - start-runner-arm
      - build
      - merge
    runs-on: ubuntu-latest
    if: ${{ always() }}
    steps:
      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v1
        with:
          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          aws-region: ${{ env.AWS_REGION }}
      - name: Stop EC2 runner
        uses: machulav/ec2-github-runner@v2
        with:
          mode: stop
          github-token: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}
          label: ${{ needs.start-runner-arm.outputs.label }}
          ec2-instance-id: ${{ needs.start-runner-arm.outputs.ec2-instance-id }}