[INFRA] Send a slack notification after release (#180)

.github/workflows/release.yml

@@ -82,3 +82,48 @@ jobs:
           access_token: ${{ secrets.GH_RELEASE_TOKEN }}
           enforce_admins: true
           branch: main
+      - name: Send message to Slack channel
+        if: success()
+        uses: slackapi/[email protected]
+        with:
+          channel-id: 'CSF7TG6N5'
+          payload: |
+            {
+              "blocks": [
+                {
+                  "type": "header",
+                  "text": {
+                    "type": "plain_text",
+                    "text": ":mega: bpmnVisualizationR release ${{ steps.release_version.outputs.version_tag }}",
+                    "emoji": true
+                  }
+                },
+                {
+                  "type": "divider"
+                },
+                {
+                  "type": "section",
+            	  "accessory": {
+                    "type": "image",
+                    "image_url": "https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/R_logo.svg/1448px-R_logo.svg.png",
+                    "alt_text": "Haunted hotel image"
+                  },
+                  "text": {
+                    "type": "mrkdwn",
+                    "text": "- <https://github.com/${{github.repository}}/tree/${{ steps.release_version.outputs.version_tag }}|Tag> done :heavy_check_mark:"
+                  }
+                },
+                {
+                  "type": "divider"
+                },
+                {
+                  "type": "section",
+                  "text": {
+                    "type": "mrkdwn",
+                    "text": "See the next steps <https://github.com/${{github.repository}}/blob/main/MAINTAINERS.md#release-process|here> :arrow_left:"
+                  }
+                }
+              ]
+            }
+        env:
+          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}