added dependabot config

.github/dependabot.yml

@@ -0,0 +1,18 @@
+# Dependabot helps update dependencies to keep them up-to-date.
+# Configuration docs: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 1
+    reviewers:
+      - "customerio/mobile"
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+    groups:
+      github-action-dependencies:
+        patterns:
+        - "*"