Implements slack-notifications when the plugin is released.

Author: sbglasius

.github/workflows/release.yml

@@ -130,3 +130,26 @@ jobs:
           VERSION: ${{ needs.publish.outputs.release_version }}
       - name: "⚙️ Run post-release"
         uses: apache/grails-github-actions/post-release@asf
+    notify-slack:
+      name: Notify Slack
+      needs: [ build, publish ] # adjust depending on your job names
+      if: ${{ success() }}
+      runs-on: ubuntu-latest
+      steps:
+        - name: Send Slack message
+          uses: slackapi/slack-github-action@v1.27.0
+          with:
+            payload: |
+              {
+                "text": ":rocket: *${{ github.repository }}* just released *${{ github.event.release.tag_name }}*",
+                "attachments": [
+                  {
+                    "color": "#36a64f",
+                    "title": "${{ github.event.release.name }}",
+                    "title_link": "${{ github.event.release.html_url }}",
+                    "text": "${{ github.event.release.body }}"
+                  }
+                ]
+              }
+          env:
+            SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}