feat(pr-title): Add job summary and PR comments (#91)

.github/workflows/pr-title.yaml

@@ -2,7 +2,8 @@ name: Validate PR title
 
 on:
   pull_request_target:
-    types: [opened, edited, synchronize]
+    types: [opened, edited]
+    branches: [main]
   workflow_call: {}
 
 # Disable permissions for all available scopes
@@ -13,13 +14,48 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  conventional-pr-title:
+  validate-pr-title:
     permissions:
-      pull-requests: read
+      pull-requests: write
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
       - name: Validate pull request title is conventional
+        id: lint-pr-title
         uses: amannn/action-semantic-pull-request@47b15d52c5c30e94a17ec87eb8dd51ff5221fed9 # v5.3.0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Add PR comment on failure
+        if: always() && (steps.lint-pr-title.outputs.error_message != null)
+        uses: marocchino/sticky-pull-request-comment@331f8f5b4215f0445d3c07b4967662a32a2d3e31 # v2.9.0
+        with:
+          header: pr-title-lint-error
+          message: |
+            Pull request titles should follow the [Conventional Commits specification](https://www.conventionalcommits.org/en/v1.0.0/) and it looks like the proposed title needs to be adjusted.
+
+            Details:
+
+            ```
+            ${{ steps.lint-pr-title.outputs.error_message }}
+            ```
+
+      - name: Delete PR comment on resolution
+        if: always() && (steps.lint-pr-title.outputs.error_message == null)
+        uses: marocchino/sticky-pull-request-comment@331f8f5b4215f0445d3c07b4967662a32a2d3e31 # v2.9.0
+        with:
+          header: pr-title-lint-error
+          delete: true
+
+      - name: Summary
+        if: always() && (steps.lint-pr-title.outputs.error_message == null)
+        run: |
+          echo "# :white_check_mark: Pull Request title is valid" >> $GITHUB_STEP_SUMMARY
+
+      - name: Summary
+        if: always() && (steps.lint-pr-title.outputs.error_message != null)
+        run: |
+          echo "# :bangbang: Pull Request title is invalid" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "add something here depending on what the below looks like" >> $GITHUB_STEP_SUMMARY
+          echo "${{ steps.lint-pr-title.outputs.error_message }}" >> $GITHUB_STEP_SUMMARY