fix docker buildx args

Signed-off-by: Mikhail Sidorov <mixity@yandex.ru>

pkg/plugins/golang/v3/scaffolds/internal/templates/makefile.go

@@ -152,7 +152,7 @@ docker-buildx: test ## Build and push docker image for the manager for cross-pla
 	sed -e '1 s/\(^FROM\)/FROM --platform=\$$\{BUILDPLATFORM\}/; t' -e ' 1,// s//FROM --platform=\$$\{BUILDPLATFORM\}/' Dockerfile > Dockerfile.cross
 	- docker buildx create --name project-v3-builder
 	docker buildx use project-v3-builder
-	- docker buildx build --push --platform=$(PLATFORMS) --tag ${IMG} -f Dockerfile.cross
+	- docker buildx build --push --platform=$(PLATFORMS) --tag ${IMG} -f Dockerfile.cross .
 	- docker buildx rm project-v3-builder
 	rm Dockerfile.cross