feat: Events: Auto PR comments

Signed-off-by: Samuel Giffard <[email protected]>

.github/workflows/deploy-image.yml

@@ -12,14 +12,19 @@ on:
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository_owner }}/dvalin-tools-event-agent
+  IMAGE_NAME: dvalin-tools-event-agent
+  IMAGE_NAME_DOUBLE_DASH: dvalin--tools--event--agent
+  TAG_NAME: ${{ github.repository_owner }}/dvalin-tools-event-agent
+  COMMENT_ANCHOR: "<!--- This comment is auto-generated by a GitHub Action :: ${{ github.repository_owner }}/dvalin-tools-event-agent --->"
 
 jobs:
   build-and-push-image:
     runs-on: ubuntu-latest
     permissions:
       contents: read
+      issues: write
       packages: write
+      pull-requests: write
     steps:
 
       - name: Checkout repository
@@ -36,7 +41,7 @@ jobs:
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          images: ${{ env.REGISTRY }}/${{ env.TAG_NAME }}
           tags: |
             type=ref,event=branch
             type=ref,event=pr
@@ -53,3 +58,43 @@ jobs:
           target: runtime-prod
           build-args: |
             DVALIN_REPO_ROOT_DIR=/usr/src/repo/dvalin-data
+
+      - name: Find Comment
+        uses: peter-evans/find-comment@v3
+        id: fc
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          comment-author: 'github-actions[bot]'
+          body-includes: ${{ env.COMMENT_ANCHOR }}
+
+      - name: Add PR comment with Docker image info
+        if: github.event_name == 'pull_request'
+        uses: peter-evans/create-or-update-comment@v4
+        with:
+          comment-id: ${{ steps.fc.outputs.comment-id }}
+          issue-number: ${{ github.event.pull_request.number }}
+          edit-mode: replace
+          reactions: rocket
+          body: |
+            ${env.COMMENT_ANCHOR}
+            
+            :whale: Docker image for PR #${{ github.event.pull_request.number }} has been built and pushed!
+            
+            ![Static Badge][badge-docker-pr]
+            
+            **Image:** `${{ env.REGISTRY }}/${{ env.TAG_NAME }}:pr-${{ github.event.pull_request.number }}`
+            
+            Install from the command line
+            ```bash
+            docker pull ${{ env.REGISTRY }}/${{ env.TAG_NAME }}:pr-${{ github.event.pull_request.number }}
+            ```
+            
+            Use as base image in Dockerfile:
+            ```Dockerfile
+            FROM ${{ env.REGISTRY }}/${{ env.TAG_NAME }}:pr-${{ github.event.pull_request.number }}
+            ```
+            
+            For more details, visit our [GitHub Packages][gh-packages].
+            
+            [gh-packages]: https://github.com/${{ github.repository }}/pkgs/container/${{ env.IMAGE_NAME }}
+            [badge-docker-pr]: https://img.shields.io/badge/${{ env.IMAGE_NAME_DOUBLE_DASH }}-PR--${{ github.event.pull_request.number }}-blue?logo=docker