add dependabot for gradle

Author: irisieren

.github/dependabot.yaml

@@ -9,3 +9,11 @@ updates:
     ignore:
       - dependency-name: "*"
         update-types: ["version-update:semver-patch"] # ignore patch updates
+
+  - package-ecosystem: "gradle"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    ignore:
+      - dependency-name: "*"
+        update-types: ["version-update:semver-patch"] # ignore patch updates