build: improve Makefile

Author: yuuki

Makefile

@@ -1,3 +1,5 @@
+.PHONY: build test docker/build
+
 OUT_BIN := connperf
 GO := $(shell which go)
 GO_SRC := $(shell find . -type f -name '*.go')
@@ -11,9 +13,8 @@ build: $(OUT_BIN)
 $(OUT_BIN): $(filter-out *_test.go,$(GO_SRC))
 	go build -o $(OUT_BIN)
 
-.PHONY: docker test
-docker:
-	$(CMD_DOCKER) build -t $(OUT_DOCKER):latest .
-
 test:
-	$(GO) test ./...
+	$(GO) test -v ./...
+
+docker/build:
+	$(CMD_DOCKER) build -t $(OUT_DOCKER):latest .