mempool/.github/workflows/docker.yml

name: Docker build on tag
env:
  DOCKER_CLI_EXPERIMENTAL: enabled
  TAG_FMT: "^refs/tags/(((.?[0-9]+){3,4}))$"
  DOCKER_BUILDKIT: 1  # Enable BuildKit for better performance
  COMPOSE_DOCKER_CLI_BUILD: 0

on:
  push:
    tags:
      - v[0-9]+.[0-9]+.[0-9]+
      - v[0-9]+.[0-9]+.[0-9]+-*
  pull_request:
    types: [opened, synchronize, reopened, labeled]

permissions:
  contents: read

jobs:
  build:
    # Run on tag pushes OR on PRs that have the "docker" label
    if: |
      github.event_name == 'push' ||
      (github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'docker'))
    strategy:
      matrix:
        service:
          - frontend
          - backend
    runs-on: ubuntu-latest
    timeout-minutes: 120
    name: Build and push to DockerHub
    outputs:
      image-digest-frontend: ${{ matrix.service == 'frontend' && steps.docker-build.outputs.digest || '' }}
      image-digest-backend: ${{ matrix.service == 'backend' && steps.docker-build.outputs.digest || '' }}
    steps:
      - name: Replace the current swap file
        shell: bash
        run: |
          sudo swapoff /mnt/swapfile || true
          sudo rm -f /mnt/swapfile
          sudo fallocate -l 16G /mnt/swapfile
          sudo chmod 600 /mnt/swapfile
          sudo mkswap /mnt/swapfile
          sudo swapon /mnt/swapfile

      - name: Show current memory and swap status
        shell: bash
        run: |
          sudo free -h
          echo
          sudo swapon --show

      - name: Mount a tmpfs over /var/lib/docker
        shell: bash
        run: |
          if [ ! -d "/var/lib/docker" ]; then
            echo "Directory '/var/lib/docker' not found"
            exit 1
          fi
          sudo mount -t tmpfs -o size=12G tmpfs /var/lib/docker
          sudo systemctl restart docker
          sudo df -h | grep docker

      # Only for tag pushes: use the Git tag as TAG
      - name: Set TAG from pushed tag
        if: github.event_name == 'push'
        run: echo "TAG=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV

      - name: Add SHORT_SHA env property with commit short sha
        run: echo "SHORT_SHA=$(echo ${GITHUB_SHA} | cut -c1-8)" >> $GITHUB_ENV

      - name: Login to Docker for building
        run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin

      - name: Checkout project
        uses: actions/checkout@v4

      # For PRs: use package.json version + short sha as TAG
      - name: Set TAG from package.json for pull requests
        if: github.event_name == 'pull_request'
        run: |
          VERSION=$(jq -r '.version' backend/package.json)
          echo "TAG=v${VERSION}-${SHORT_SHA}" >> $GITHUB_ENV

      - name: Show set environment variables
        run: |
          printf "      TAG: %s\n"  "$TAG"
          printf " SHORT_SHA: %s\n" "$SHORT_SHA"

      - name: Init repo for Dockerization
        run: docker/init.sh "$TAG"

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
        with:
          platforms: linux/amd64,linux/arm64
        id: qemu

      - name: Setup Docker buildx action
        uses: docker/setup-buildx-action@v3
        with:
          platforms: linux/amd64,linux/arm64
          driver-opts: |
            network=host
        id: buildx

      - name: Available platforms
        run: echo ${{ steps.buildx.outputs.platforms }}

      - name: Cache Docker layers
        uses: actions/cache@v3
        id: cache
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ matrix.service }}-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-${{ matrix.service }}-

      - name: Run Docker buildx for ${{ matrix.service }} against tag
        id: docker-build
        run: |
          docker buildx build \
          --cache-from "type=local,src=/tmp/.buildx-cache" \
          --cache-to "type=local,dest=/tmp/.buildx-cache,mode=max" \
          --platform linux/amd64,linux/arm64 \
          --tag ${{ secrets.DOCKER_HUB_USER }}/${{ matrix.service }}:$TAG \
          --build-context rustgbt=./rust \
          --build-context backend=./backend \
          --output "type=registry,push=true" \
          --build-arg commitHash=$SHORT_SHA \
          ./${{ matrix.service }}/

  tag-latest:
    needs: build
    # Only for successful *tag pushes* and only for "plain" versions (no '-')
    if: ${{ needs.build.result == 'success' && github.event_name == 'push' && !contains(github.ref_name, '-') }}
    runs-on: ubuntu-latest
    timeout-minutes: 30
    name: Tag release build as latest
    strategy:
      matrix:
        service:
          - frontend
          - backend
    steps:
      - name: Set env variables
        run: echo "TAG=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
        with:
          platforms: linux/amd64,linux/arm64

      - name: Setup Docker buildx action
        uses: docker/setup-buildx-action@v3
        with:
          platforms: linux/amd64,linux/arm64
          driver-opts: |
            network=host

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

      - name: Tag as latest for ${{ matrix.service }}
        run: |
          docker buildx imagetools create \
            --tag ${{ secrets.DOCKER_HUB_USER }}/${{ matrix.service }}:latest \
            ${{ secrets.DOCKER_HUB_USER }}/${{ matrix.service }}:$TAG