Enabled dependabot for Github Actions

Author: aweiland

.github/dependabot.yml

@@ -1,5 +1,14 @@
 version: 2
 updates:
+  - package-ecosystem: "github-actions"
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "[GHA] Dependabot:"
+      prefix-development: "[GHA-dev] Dependabot:"
+    pull-request-branch-name:
+      separator: "-"
   - package-ecosystem: 'npm'
     directory: '/'
     schedule: