build go application within this projects directories

 APP_NAME = steffers.org
 APP_VERSION = 0.0.1
 
-GOPATH ?= $(HOME)/go
+GOPATH = $(PWD)
 GOPROJECT = gitlab.weird-web-workers.org/ghopp/$(APP_NAME)
 GOEXE = $(GOPATH)/bin/$(APP_NAME)
 
@@ -15,8 +15,8 @@ export APP_NAME DOCKER_IMAGE_TAG GOEXE
 
 all: docker
 
-$(GOEXE): $(APP_NAME).go
-	go install $(GOPROJECT)
+$(GOEXE): $(GOPATH)/src/$(GOPROJECT)/main.go
+	GOPATH=$(GOPATH) go install $(GOPROJECT)
 	strip $@
 
 docker: react $(GOEXE)