add cluster version check

Signed-off-by: NikitaSkrynnik <[email protected]>

.github/workflows/ci.yaml

@@ -62,6 +62,11 @@ jobs:
               | jq '.channels[] | select (.channel=="REGULAR") | .validVersions[]' \
               | grep -m 1 "$K8S_VERSION" | tr -d '"')
 
+            if [ -z "$GKE_CLUSTER_VERSION"]; then
+              echo "GKE cluster version is not valid"
+              exit 1
+            fi
+
             gcloud components install gke-gcloud-auth-plugin
             gcloud components update