chore: add dependabot go.mod check on ./test

Signed-off-by: Carlos Salas <carlos.salas@suse.com>

.github/dependabot.yaml

@@ -1,5 +1,6 @@
 version: 2
 updates:
+  # Main Go module
   - package-ecosystem: "gomod"
     directory: "/"
     schedule:
@@ -17,6 +18,24 @@ updates:
       - dependency-name: "k8s.io/*"
       - dependency-name: "go.etcd.io/*"
       - dependency-name: "google.golang.org/grpc"
+  # Test Go module
+  - package-ecosystem: "gomod"
+    directory: "/test"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "kind/cleanup"
+      - "area/dependency"
+    ignore:
+      # Ignore Cluster-API as its upgraded manually.
+      - dependency-name: "sigs.k8s.io/cluster-api"
+      # Ignore controller-runtime as its upgraded manually.
+      - dependency-name: "sigs.k8s.io/controller-runtime"
+      # Ignore k8s and its transitives modules as they are upgraded manually
+      # together with controller-runtime.
+      - dependency-name: "k8s.io/*"
+      - dependency-name: "go.etcd.io/*"
+      - dependency-name: "google.golang.org/grpc"
   - package-ecosystem: "docker"
     directory: "/"
     schedule: