chore: add github action to cascade github annoucements to slack community

.github/workflows/slack-announcements.yml

@@ -0,0 +1,41 @@
+name: Post Announcements to Slack
+
+on:
+  discussion:
+    types: [created, edited]
+
+jobs:
+  notify-slack:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check if announcement
+        id: check
+        run: |
+          # GitHub API check to verify it's in announcements category
+          
+      - name: Post to Slack
+        if: steps.check.outputs.is_announcement == 'true'
+        uses: slackapi/slack-github-action@v1
+        with:
+          payload: |
+            {
+              "text": "New Announcement: ${{ github.event.discussion.title }}",
+              "blocks": [
+                {
+                  "type": "section",
+                  "text": {
+                    "type": "mrkdwn",
+                    "text": "*${{ github.event.discussion.title }}*\n${{ github.event.discussion.body }}"
+                  }
+                },
+                {
+                  "type": "section",
+                  "text": {
+                    "type": "mrkdwn",
+                    "text": "<${{ github.event.discussion.html_url }}|View Discussion>"
+                  }
+                }
+              ]
+            }
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_DOGRAH_COMMUNITY_WEBHOOK_URL }}