Minor improvements to Dockerfile and Makefile

Signed-off-by: Jun Duan <jun.duan.phd@outlook.com>

Author: waltforme

Makefile

@@ -79,7 +79,7 @@ load-test-server-local:
 
 .PHONY: build-test-launcher-local
 build-test-launcher-local:
-	docker build -t ${TEST_LAUNCHER_IMG} -f dockerfiles/Dockerfile.launcher.cpu . --progress=plain --platform linux/$(TARGETARCH) --build-arg TARGETARCH=$(TARGETARCH)
+	docker build -t ${TEST_LAUNCHER_IMG} -f dockerfiles/Dockerfile.launcher.cpu . --progress=plain --platform linux/$(shell go env GOARCH)
 
 .PHONY: load-test-launcher-local
 load-test-launcher-local:

dockerfiles/Dockerfile.launcher.cpu

@@ -1,5 +1,5 @@
 # Dockerfile for launcher using vLLM CPU images (for tests without GPU)
-# Supports both arm64 and x86_64 architectures
+# Supports both arm64 and amd64 architectures
 
 ARG TARGETARCH
 ARG VLLM_VERSION=v0.15.0