Add dependabot config (#60)

* Add dependabot config.

* Screwing up indentation to make yamllint happy.

* Group updates together.

* Fix indentation.

Author: felixfontein

.github/dependabot.yml

@@ -0,0 +1,16 @@
+---
+# Copyright (c) Ansible Project
+# GNU General Public License v3.0+
+# (see https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+version: 2
+updates:
+- package-ecosystem: "github-actions"
+  directory: "/"
+  schedule:
+    interval: "weekly"
+    groups:
+      ci:
+        patterns:
+        - "*"