Call go-bindata and gofmt from docker too

Makefile

@@ -215,14 +215,22 @@ extract:
 
 # Regenerates assets.go when template files have been updated
 pkg/minikube/assets/assets.go: $(shell find deploy/addons -type f)
+ifeq ($(MINIKUBE_BUILD_IN_DOCKER),y)
+	$(call DOCKER,$(BUILD_IMAGE),/usr/bin/make $@)
+else
 	which go-bindata || GO111MODULE=off GOBIN=$(GOPATH)/bin go get github.com/jteeuwen/go-bindata/...
 	PATH="$(PATH):$(GOPATH)/bin" go-bindata -nomemcopy -o pkg/minikube/assets/assets.go -pkg assets deploy/addons/...
 	-gofmt -s -w $@
+endif
 
 pkg/minikube/translate/translations.go: $(shell find translations/ -type f)
+ifeq ($(MINIKUBE_BUILD_IN_DOCKER),y)
+	$(call DOCKER,$(BUILD_IMAGE),/usr/bin/make $@)
+else
 	which go-bindata || GO111MODULE=off GOBIN=$(GOPATH)/bin go get github.com/jteeuwen/go-bindata/...
 	PATH="$(PATH):$(GOPATH)/bin" go-bindata -nomemcopy -o pkg/minikube/translate/translations.go -pkg translate translations/...
 	-gofmt -s -w $@
+endif
 	@#golint: Json should be JSON (compat sed)
 	@sed -i -e 's/Json/JSON/' $@ && rm -f ./-e