comment_pr_diff.yml

# comment_pr_diff.yml
# From https://github.com/orgs/community/discussions/51403z
name: Comment Artifact Diff files URL on PR

on:
  workflow_run:
    types:
      - "completed"
    workflows:
      - "Diff"

jobs:
  comment-on-pr:
    if: github.event.workflow_run.conclusion == 'success'
    runs-on: ubuntu-latest
    steps:
      - name: Test
        run: |
          pwd

      - name: Get Artifact URL & PR Info
        env:
          GITHUB_TOKEN: ${{ github.token }}
          OWNER: ${{ github.repository_owner }}
          REPO: ${{ github.event.repository.name }}
          WORKFLOW_RUN_EVENT_OBJ: ${{ toJSON(github.event.workflow_run) }}
        run: |

          PREVIOUS_JOB_ID=$(jq -r '.id' <<< "$WORKFLOW_RUN_EVENT_OBJ")
          echo "Previous Job ID: $PREVIOUS_JOB_ID"
          echo "PREVIOUS_JOB_ID=$PREVIOUS_JOB_ID" >> "$GITHUB_ENV"

          ARTIFACT_URL=$(gh api "/repos/$OWNER/$REPO/actions/artifacts" \
            --jq ".artifacts.[] |
            select(.workflow_run.id==${PREVIOUS_JOB_ID}) |
            select(.expired==false) |
            .archive_download_url")

          echo "ARTIFACT URL: $ARTIFACT_URL"
          echo "ARTIFACT_URL=$ARTIFACT_URL" >> "$GITHUB_ENV"

          PR_NUMBER=$(jq -r '.pull_requests[0].number' \
            <<< "$WORKFLOW_RUN_EVENT_OBJ")

          echo "PR Number: $PR_NUMBER"
          echo "PR_NUMBER=$PR_NUMBER" >> "$GITHUB_ENV"

          HEAD_SHA=$(jq -r '.pull_requests[0].head.sha' \
            <<< "$WORKFLOW_RUN_EVENT_OBJ")

          echo "Head sha: $HEAD_SHA"
          echo "HEAD_SHA=$HEAD_SHA" >> "$GITHUB_ENV"

      - name: Update Comment
        env:
          JOB_PATH: "${{ github.server_url }}/${{ github.repository }}/actions/\
            runs/${{ env.PREVIOUS_JOB_ID }}"
          HEAD_SHA: ${{ env.HEAD_SHA }}
        uses: peter-evans/create-or-update-comment@v2
        with:
          issue-number: ${{ env.PR_NUMBER }}
          body: |-
            ## Diff preview files are ready!

            [![badge]]($JOB_PATH)

            You can find files attached to the below linked Workflow Run URL (Logs).

            | Name      | Link
            --------------------------------------------------------------------
            | Commit    | ${{ env.HEAD_SHA }}

            | Logs      | ${{ env.JOB_PATH }}

            | Jar Files | ${{ env. ARTIFACT_URL }}

            [badge]: https://img.shields.io/badge/Build-Success!-3fb950?logo=github&style=for-the-badge