make build-debug as its own target

.make/go.mk

@@ -95,7 +95,10 @@ install: $(SOURCES)
 	go install -v -tags '$(TAGS)' -ldflags '$(LDFLAGS)' ./cmd/$(NAME)
 
 .PHONY: build
-build: $(BIN)/$(EXECUTABLE) $(BIN)/$(EXECUTABLE)-debug
+build: $(BIN)/$(EXECUTABLE)
+
+.PHONY: build-debug
+build-debug: $(BIN)/$(EXECUTABLE)-debug
 
 $(BIN)/$(EXECUTABLE): $(SOURCES)
 	$(GOBUILD) -v -tags '$(TAGS)' -ldflags '$(LDFLAGS)' -o $@ ./cmd/$(NAME)