Allow the configure golang flags

Signed-off-by: Sebastian Sch <[email protected]>

Makefile

@@ -34,6 +34,12 @@ IMAGE_BUILD_OPTS += $(DOCKERARGS)
 # Go tools
 GO      = go
 Q = $(if $(filter 1,$V),,@)
+# Go settings
+GO_BUILD_OPTS ?=CGO_ENABLED=0
+GO_LDFLAGS ?=
+GO_FLAGS ?=
+GO_TAGS ?=-tags no_openssl
+export GOPATH?=$(shell go env GOPATH)
 
 .PHONY: all
 all: lint build test-coverage
@@ -48,7 +54,7 @@ build: $(BUILDDIR)/$(BINARY_NAME) ; $(info Building $(BINARY_NAME)...) ## Build
 	$(info Done!)
 
 $(BUILDDIR)/$(BINARY_NAME): $(GOFILES) | $(BUILDDIR)
-	@cd $(BASE)/cmd/$(PACKAGE) && CGO_ENABLED=0 $(GO) build -o $(BUILDDIR)/$(BINARY_NAME) -tags no_openssl -ldflags $(LDFLAGS) -v
+	@cd $(BASE)/cmd/$(PACKAGE) && $(GO_BUILD_OPTS) $(GO) build -o $(BUILDDIR)/$(BINARY_NAME) $(GO_TAGS) -ldflags $(LDFLAGS) -v
 
 # Tools