ci: add release notifier

Author: stdavis

.github/workflows/release.yml

@@ -58,3 +58,18 @@ jobs:
           project_id: ${{ secrets.PROJECT_ID }}
           build_command: npm run build -- --mode production
           firebase_config: ${{ secrets.FIREBASE_CONFIG }}
+
+  notify:
+    name: Notifications
+    runs-on: ubuntu-latest
+    needs: [deploy-cloudrun-prod, deploy-firebase-prod]
+    permissions:
+      contents: read
+      pull-requests: write
+      issues: write
+
+    steps:
+      - name: Release Notifier
+        uses: agrc/release-issue-notifications-action@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}