Setup dependabot

Dependabot can help us keep the repo up-to-date.

.github/dependabot.yml

@@ -0,0 +1,18 @@
+# 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:
+  # Open PR for gem updates
+  - package-ecosystem: "bundler" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "daily"
+
+  # Open PR for GitHub Actions updates
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"