Fix shellcheck warning in smoke workflow

Quote variable in numeric comparison to prevent globbing and word splitting.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: janisz

.github/workflows/smoke.yml

@@ -136,7 +136,7 @@ jobs:
               break
             fi
 
-            if [ $i -eq 180 ]; then
+            if [ "$i" -eq 180 ]; then
               echo "ERROR: Cluster did not become healthy after 180 attempts (6 minutes)"
               echo "Current status: $CLUSTER_HEALTH"
               exit 1