pr-docker-build.yaml

# Copyright 2023 The Janus IDP Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

name: PR Docker Build

on:
  pull_request_target:
    paths-ignore:
      - 'docs/**'
      - 'showcase-docs/**'
      - '.changeset/**'
    branches-ignore:
      - 'changeset-release/**'

concurrency:
  group: ${{ github.workflow }}-${{ github.event.number || github.event.pull_request.head.ref }}
  cancel-in-progress: true

env:
  REGISTRY: quay.io

jobs:
  pr-docker-build:
    name: PR Docker Build
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      pull-requests: write

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          ref: ${{ github.event.pull_request.head.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}

      - name: Get the latest commits from base branch
        run: |
          git remote add base-origin https://github.com/janus-idp/backstage-showcase || true
          git config user.name "${{ github.event.pull_request.user.login }}"
          git config user.email "${{ github.event.pull_request.user.email }}"
          echo "Updating PR with latest commits from ${{ github.event.pull_request.base.ref }} ..."
          git fetch base-origin ${{ github.event.pull_request.base.ref }}
          git merge --no-edit base-origin/${{ github.event.pull_request.base.ref }}

      - name: Get the last commit short SHA of the PR
        run: |
          SHORT_SHA=$(git rev-parse --short ${{ github.event.pull_request.head.sha }})
          echo "SHORT_SHA=$SHORT_SHA" >> $GITHUB_ENV
          if [[ -f packages/app/src/build-metadata.json ]]; then
            repoPR="${{ github.repository }}/pull/${{ github.event.number }}"
            now="$(date -u +%FT%TZ)"
            sed -i packages/app/src/build-metadata.json -r \
              -e 's|("Last Commit:.+)|"Last Commit: '$repoPR' @ '$SHORT_SHA'"|'
          fi

      - name: Build and Push with Buildx
        uses: ./.github/actions/docker-build
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ vars.QUAY_USERNAME }}
          password: ${{ secrets.QUAY_TOKEN }}
          imageName: ${{ github.repository }}
          imageTags: |
            type=ref,prefix=pr-,event=pr
            type=ref,prefix=pr-,suffix=-${{ env.SHORT_SHA }},event=pr
          # to autodelete PR image tags, set an expiry date
          imageLabels: quay.expires-after=14d
          push: true

      - name: Comment the image pull link
        uses: actions/github-script@v7
        with:
          script: |
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: 'The image is available at: `quay.io/${{ github.repository }}:pr-${{ github.event.number }}`!'
            })