new: dev: create initial dependabot.yml

Author: sarnold

.github/dependabot.yml

@@ -0,0 +1,12 @@
+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    commit-message:
+      prefix: "ci:"
+    labels: ["actions"]
+    # only needed for non-default branch
+    #target-branch: "develop"