Add slack monitor action (#11684)

.github/workflows/monitor-slack-link.yml

@@ -0,0 +1,53 @@
+#  Copyright 2021 Collate
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#  http://www.apache.org/licenses/LICENSE-2.0
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+name: monitor-slack-link
+on:
+  schedule:
+    - cron:  '0 */2 * * *'
+  workflow_dispatch:
+
+permissions:
+  id-token: write
+  contents: read
+
+jobs:
+  monitor-slack-link:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Monitor Link
+      id: monitor
+      continue-on-error: true
+      run: |
+        sudo apt-get update && sudo apt-get install -y jq
+        
+        curl -XPOST \
+          https://www.linkmonitor.dev/api/v1/validate \
+          -H "Content-Type: application/json" \
+          --data '{"url": "https://slack.open-metadata.org"}' | jq -e '.status == "active"' || exit 1
+
+    - name: Slack on Failure
+      if: steps.monitor.outcome != 'success'
+      uses: slackapi/slack-github-action@v1.23.0
+      with:
+        payload: |
+          {
+            "text": "🔥 Slack invitation link has expired! 🔥"
+          }
+      env:
+        SLACK_WEBHOOK_URL: ${{ secrets.SLACK_MONITOR_SLACK_WEBHOOK }}
+        SLACK_WEBHOOK_TYPE: INCOMING_WEBHOOK
+
+    - name: Force failure
+      if: steps.monitor.outcome != 'success'
+      run: |
+        exit 1