Add 'go test' Makefile target

Signed-off-by: Ionut Balutoiu <ibalutoiu@cloudbasesolutions.com>

Makefile

@@ -1,14 +1,21 @@
 SHELL := bash
 
-.PHONY : build-static
-
 IMAGE_TAG = garm-build
 
 USER_ID=$(shell ((docker --version | grep -q podman) && echo "0" || id -u))
 USER_GROUP=$(shell ((docker --version | grep -q podman) && echo "0" || id -g))
 
+GO_PACKAGES?=$(shell (go list ./... | grep -v 'vendor'))
+
+default: build-static
+
+.PHONY : build-static
 build-static:
 	@echo Building garm
 	docker build --tag $(IMAGE_TAG) .
 	docker run --rm -e USER_ID=$(USER_ID) -e USER_GROUP=$(USER_GROUP) -v $(PWD):/build/garm:z $(IMAGE_TAG) /build-static.sh
 	@echo Binaries are available in $(PWD)/bin
+
+.PHONY: test
+test:
+	go test $(GO_PACKAGES) -v $(TEST_ARGS) -timeout=15m -parallel=4