chore: slack for broken links (#19156)

.github/workflows/md-link-checker.yml

@@ -13,3 +13,19 @@ jobs:
         with:
           folder-path: "docs"
       - run: cd docs && sh ./post.sh
+  sims-notify-failure:
+    permissions:
+      contents: none
+    runs-on: ubuntu-latest
+    if: ${{ failure() }}
+    steps:
+      - name: Notify Slack on failure
+        uses: rtCamp/action-slack-notify@v2.2.1
+        env:
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+          SLACK_CHANNEL: sdk-sims
+          SLACK_USERNAME: Broken Links
+          SLACK_ICON_EMOJI: ":skull:"
+          SLACK_COLOR: danger
+          SLACK_MESSAGE: Links are broken in docs
+          SLACK_FOOTER: ""