Add dependabot config

Author: tvdijen

.github/dependabot.yml

@@ -0,0 +1,16 @@
+---
+
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"  # See documentation for possible values
+    directory: "/"  # Location of package manifests
+    schedule:
+      interval: "monthly"
+    groups:
+      all-actions:
+        patterns: ["*"]