[k8s] Fix GPU detection when running with sky local up --ips (#4561)

Fix GPU detection with explicit return values

sky/utils/kubernetes/deploy_remote_cluster.sh

@@ -93,11 +93,11 @@ cleanup_agent_node() {
 
 check_gpu() {
     local NODE_IP=$1
-    run_remote "$NODE_IP" "
-        if command -v nvidia-smi &> /dev/null; then
-            nvidia-smi --list-gpus | grep 'GPU 0'
-        fi
-    "
+    if run_remote "$NODE_IP" "command -v nvidia-smi &> /dev/null && nvidia-smi --query-gpu=gpu_name --format=csv,noheader &> /dev/null"; then
+        return 0  # GPU detected
+    else
+        return 1  # No GPU detected
+    fi
 }
 
 # Pre-flight checks