feat(kubernetes): allow setting cluster name in in-cluster mode (#7695)

docs/tutorials/kubernetes/in-cluster.md

@@ -20,3 +20,19 @@ kubectl logs prowler-XXXXX --namespace prowler-ns
 
 ???+ note
     By default, `prowler` will scan all namespaces in your active Kubernetes context. Use the [`--namespace`](https://docs.prowler.com/projects/prowler-open-source/en/latest/tutorials/kubernetes/namespace/) flag to specify the namespace(s) to be scanned.
+
+???+ tip "Identifying the cluster in reports"
+    When running in in-cluster mode, the Kubernetes API does not expose the actual cluster name by default.
+
+    To uniquely identify the cluster in logs and reports, you can:
+
+    - Use the `--cluster-name` flag to manually set the cluster name:
+    ```bash
+    prowler -p kubernetes --cluster-name production-cluster
+    ```
+    - Or set the `CLUSTER_NAME` environment variable:
+    ```yaml
+    env:
+        - name: CLUSTER_NAME
+          value: production-cluster
+    ```