main.yml

name: CI

on: [push, pull_request]

permissions:
  contents: read

jobs:
  test:
    env:
      MIX_ENV: test
    runs-on: ubuntu-24.04
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          persist-credentials: false

      - uses: erlef/setup-beam@ee09b1e59bb240681c382eb1f0abc6a04af72764 # v1.23.0
        with:
          otp-version: 27.2
          elixir-version: 1.18.1

      - run: mix deps.get
      - run: mix format --check-formatted
      - run: mix deps.unlock --check-unused
      - run: MIX_ENV=test mix compile --warnings-as-errors
      - run: mix test

  docker:
    name: Docker (${{ matrix.platform }})
    runs-on: ${{ matrix.runner }}

    permissions:
      contents: 'read'
      id-token: 'write'

    strategy:
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-24.04
          - platform: linux/arm64
            runner: ubuntu-24.04-arm

    env:
      IMAGE_NAME: 'diff'
      PROJECT_ID: 'hexpm-prod'
      SERVICE_ACCOUNT: ${{ secrets.GCLOUD_SERVICE_ACCOUNT }}
      WORKLOAD_IDENTITY_PROVIDER: ${{ secrets.GCLOUD_WORKFLOW_IDENTITY_POOL_PROVIDER }}

    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          persist-credentials: false

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd # v4.0.0

      - name: Google auth
        id: auth
        uses: 'google-github-actions/auth@7c6bc770dae815cd3e89ee6cdf493a5fab2cc093' # v3.0.0
        if: ${{ github.event_name != 'pull_request' && env.SERVICE_ACCOUNT != '' }}
        with:
          token_format: 'access_token'
          project_id: ${{ env.PROJECT_ID }}
          service_account: ${{ env.SERVICE_ACCOUNT }}
          workload_identity_provider: ${{ env.WORKLOAD_IDENTITY_PROVIDER }}

      - name: Docker Auth
        id: docker-auth
        uses: 'docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121' # v4.1.0
        if: ${{ github.event_name != 'pull_request' && env.SERVICE_ACCOUNT != '' }}
        with:
          registry: gcr.io
          username: 'oauth2accesstoken'
          password: '${{ steps.auth.outputs.access_token }}'

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@d08e5c354a6adb9ed34480a06d141179aa583294 # v7.0.0
        with:
          platforms: ${{ matrix.platform }}
          outputs: type=image,name=gcr.io/${{ env.PROJECT_ID }}/${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=${{ github.event_name != 'pull_request' && env.SERVICE_ACCOUNT != '' }}
          cache-from: type=gha,scope=${{ matrix.runner }}
          cache-to: type=gha,scope=${{ matrix.runner }},mode=max

      - name: Export digest
        if: ${{ github.event_name != 'pull_request' && env.SERVICE_ACCOUNT != '' }}
        run: |
          mkdir -p /tmp/digests
          digest="${DIGEST}"
          touch "/tmp/digests/${digest#sha256:}"
        env:
          DIGEST: ${{ steps.build.outputs.digest }}

      - name: Upload digest
        if: ${{ github.event_name != 'pull_request' && env.SERVICE_ACCOUNT != '' }}
        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
        with:
          name: digests-${{ matrix.runner }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  docker-merge:
    name: Docker Merge
    runs-on: ubuntu-24.04
    if: ${{ github.event_name != 'pull_request' && github.repository == 'hexpm/diff' }}
    needs: docker
    permissions:
      contents: 'read'
      id-token: 'write'
    env:
      IMAGE_NAME: 'diff'
      PROJECT_ID: 'hexpm-prod'
      SERVICE_ACCOUNT: ${{ secrets.GCLOUD_SERVICE_ACCOUNT }}
      WORKLOAD_IDENTITY_PROVIDER: ${{ secrets.GCLOUD_WORKFLOW_IDENTITY_POOL_PROVIDER }}
    steps:
      - name: Set short git commit SHA
        run: echo "COMMIT_SHORT_SHA=${GITHUB_SHA::7}" >> $GITHUB_ENV
      - name: Download digests
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd # v4.0.0
      - name: Google auth
        id: auth
        uses: 'google-github-actions/auth@7c6bc770dae815cd3e89ee6cdf493a5fab2cc093' # v3.0.0
        with:
          token_format: 'access_token'
          project_id: ${{ env.PROJECT_ID }}
          service_account: ${{ env.SERVICE_ACCOUNT }}
          workload_identity_provider: ${{ env.WORKLOAD_IDENTITY_PROVIDER }}
      - name: Docker Auth
        uses: 'docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121' # v4.1.0
        with:
          registry: gcr.io
          username: 'oauth2accesstoken'
          password: '${{ steps.auth.outputs.access_token }}'
      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create \
            -t gcr.io/${PROJECT_ID}/${IMAGE_NAME}:${COMMIT_SHORT_SHA} \
            $(printf "gcr.io/${PROJECT_ID}/${IMAGE_NAME}@sha256:%s " *)