Add dependabot

Author: brabadu

.github/dependabot.yml

@@ -0,0 +1,21 @@
+version: 2
+updates:
+  # Enable version updates for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+    commit-message:
+      prefix: "ci"
+      include: "scope"
+
+  # Enable version updates for Ruby dependencies
+  - package-ecosystem: "bundler"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+    commit-message:
+      prefix: "deps"
+      include: "scope"