Limit which github actions are considered for updates

Author: marko-bekhta

.github/dependabot.yml

@@ -17,4 +17,11 @@ updates:
   - package-ecosystem: github-actions
     directory: "/"
     schedule:
-      interval: daily
+      interval: monthly
+    groups:
+      workflow-actions:
+        patterns:
+          - "*"
+    allow:
+      - dependency-name: "actions/*"
+      - dependency-name: "redhat-actions/*"