add dependabot to kubectl-validate

.github/dependabot.yml

@@ -0,0 +1,21 @@
+version: 2
+updates:
+  # Maintain dependencies for go
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "ok-to-test"
+  # Update all packages under k8s scope
+  # in one group
+    groups:
+      kubernetes:
+        patterns:
+          - "k8s.io/*"
+    ignore:
+      # Ignore major and minor versions for dependencies updates
+      # Allow patches and security updates.
+      - dependency-name: k8s.io/*
+        update-types: ["version-update:semver-major", "version-update:semver-minor"]
+