fix(benchmark): use $(CONTAINER_TOOL) instead of hardcoded docker in benchmark-local (llm-d#539)

Signed-off-by: Madhu Goutham Reddy Ambati <mambati@redhat.com>
Co-authored-by: Lior Aronovich <243445518+lioraron@users.noreply.github.com>

Author: madhugoutham

Makefile

@@ -356,7 +356,7 @@ BENCHMARK_RESULTS_DIR ?= benchmarks/results/local-run
 benchmark-local:
 	@kind get clusters 2>/dev/null | grep -q $(KIND_CLUSTER_NAME) || \
 		{ echo "ERROR: Kind cluster '$(KIND_CLUSTER_NAME)' not found. Run 'make dev-deploy' first."; exit 1; }
-	@docker exec $(KIND_CLUSTER_NAME)-control-plane crictl images 2>/dev/null | grep -q batch-gateway-apiserver || \
+	@$(CONTAINER_TOOL) exec $(KIND_CLUSTER_NAME)-control-plane crictl images 2>/dev/null | grep -q batch-gateway-apiserver || \
 		{ echo "ERROR: batch-gateway images not loaded in Kind. Run 'make dev-deploy' first."; exit 1; }
 	@echo "=== Benchmark local e2e (MODE=sim, scenario $(BENCHMARK_SCENARIO)) ==="
 	@echo "Step 1/4: Setting up infrastructure..."