Add dependabot config.

.dependabot/config.yml

@@ -0,0 +1,17 @@
+# https://dependabot.com/docs/config-file/
+# https://dependabot.com/docs/config-file/validator/
+
+version: 1
+update_configs:
+  - package_manager: "ruby:bundler"
+    directory: "/"
+    update_schedule: "daily"
+    allowed_updates:
+      - match:
+          update_type: "all"
+  - package_manager: "javascript"
+    directory: "/"
+    update_schedule: "daily"
+    allowed_updates:
+      - match:
+          update_type: "all"