fix(deploy): silence shellcheck SC2034 unused loop var in sandbox wait

Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com>
Signed-off-by: Paolo Dettori <paolo.dettori@example.com>

Author: Paolo Dettori

deploy/knative/setup-kind.sh

@@ -110,7 +110,7 @@ echo "--- Deploying Sandbox CR ---"
 kubectl apply -f "$SCRIPT_DIR/sandbox.yaml"
 # Wait for the Sandbox controller to publish .status.selector, then wait for the pod
 SEL=""
-for i in $(seq 1 60); do
+for _ in $(seq 1 60); do
   SEL=$(kubectl -n default get sandbox sandbox-0 -o jsonpath='{.status.selector}' 2>/dev/null || true)
   [ -n "$SEL" ] && break
   sleep 2