custom-image.yaml

name: Build Custom Docker Image

on:
  workflow_dispatch:
    inputs:
      image:
        description: 'Image to build'
        required: false
        default: 'image'
        type: choice
        options:
          - image
          - nativelink-worker-init
          - nativelink-worker-lre-cc
      skip_signing:
        description: 'Skip cosign signing'
        required: false
        default: true
        type: boolean

  issue_comment:
    types: [created]

permissions:
  contents: read
  packages: write
  pull-requests: write
  id-token: write

jobs:
  check-trigger:
    runs-on: ubuntu-latest
    outputs:
      should_build: ${{ steps.check.outputs.should_build }}
      pr_sha: ${{ steps.check.outputs.pr_sha }}
      image: ${{ steps.check.outputs.image }}
    steps:
      - name: Check trigger
        id: check
        uses: actions/github-script@v8
        with:
          script: |
            if (context.eventName === 'workflow_dispatch') {
              core.setOutput('should_build', 'true');
              core.setOutput('pr_sha', context.sha);
              core.setOutput('image', '${{ inputs.image }}');
              return;
            }

            if (context.eventName === 'issue_comment') {
              const body = context.payload.comment.body.trim();
              const isPR = !!context.payload.issue.pull_request;

              // Match /build-image or /build-image <image-name>
              const match = body.match(/^\/build-image(?:\s+(\S+))?/i);

              if (isPR && match) {
                const { data: pr } = await github.rest.pulls.get({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  pull_number: context.payload.issue.number
                });

                const image = match[1] || 'image';
                const validImages = ['image', 'nativelink-worker-init', 'nativelink-worker-lre-cc'];

                if (!validImages.includes(image)) {
                  await github.rest.issues.createComment({
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    issue_number: context.payload.issue.number,
                    body: `Unknown image: \`${image}\`\n\nValid options: ${validImages.map(i => `\`${i}\``).join(', ')}`
                  });
                  core.setOutput('should_build', 'false');
                  return;
                }

                core.setOutput('should_build', 'true');
                core.setOutput('pr_sha', pr.head.sha);
                core.setOutput('image', image);

                await github.rest.reactions.createForIssueComment({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  comment_id: context.payload.comment.id,
                  content: 'rocket'
                });
                return;
              }
            }

            core.setOutput('should_build', 'false');

  build-image:
    name: Build and Push Image
    needs: check-trigger
    if: needs.check-trigger.outputs.should_build == 'true'
    runs-on: ubuntu-24.04
    timeout-minutes: 45
    steps:
      - name: Checkout
        uses: actions/checkout@v6
        with:
          ref: ${{ needs.check-trigger.outputs.pr_sha }}

      - name: Prepare Worker
        uses: ./.github/actions/prepare-nix

      - name: Upload image
        id: upload
        run: |
          GIT_HASH=$(git rev-parse --short HEAD)
          nix run .#publish-ghcr ${{ needs.check-trigger.outputs.image }} "$GIT_HASH"

          IMAGE_NAME=$(nix eval .#${{ needs.check-trigger.outputs.image }}.imageName --raw)
          echo "image_tag=ghcr.io/${{ github.repository_owner }}/${IMAGE_NAME}:${GIT_HASH}" >> $GITHUB_OUTPUT
        env:
          GHCR_REGISTRY: ghcr.io/${{ github.repository_owner }}
          GHCR_USERNAME: ${{ github.actor }}
          GHCR_PASSWORD: ${{ secrets.GITHUB_TOKEN }}
          SKIP_SIGNING: "true"
          SKIP_TRIVY: "true"

      - name: Output image info
        run: |
          echo "### Published Image" >> $GITHUB_STEP_SUMMARY
          echo '```' >> $GITHUB_STEP_SUMMARY
          echo "${{ steps.upload.outputs.image_tag }}" >> $GITHUB_STEP_SUMMARY
          echo '```' >> $GITHUB_STEP_SUMMARY

      - name: Comment on PR
        if: github.event_name == 'issue_comment'
        uses: actions/github-script@v8
        with:
          script: |
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.issue.number,
              body: `Image built and pushed!\n\n\`\`\`\n${{ steps.upload.outputs.image_tag }}\n\`\`\``
            });