Build multi-arch container images across stack
diff --git a/core/nebula/Makefile b/core/nebula/Makefile
index be9f307..c8b2f75 100644
--- a/core/nebula/Makefile
+++ b/core/nebula/Makefile
@@ -1,5 +1,2 @@
-image_arm64:
-	docker build --tag=giolekva/nebula:latest . --platform=linux/arm64
-
-push_arm64: image_arm64
-	docker push giolekva/nebula:latest
+push:
+	docker buildx build --tag=giolekva/nebula:latest . --platform=linux/arm64,linux/amd64 --push