Add github actions dependabot

Author: martinemde

.github/dependabot.yml

@@ -0,0 +1,11 @@
+version: 2
+updates:
+  # GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+    labels:
+      - "dependencies"
+      - "github_actions"