Shrink docker size by avoiding chown

Change-Id: I778c3993a37deef1d2eaa3d2b401d796ce8662f7
diff --git a/Makefile b/Makefile
index 5d1b22d..9a54a7e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,12 @@
-.PHONY: build build-with-models preload-models run test clean
+.PHONY: build build-slim build-with-models preload-models run test clean
 
 build:
 	docker build -t korap/conllu-spacy:latest .
 
+build-slim:
+	docker build -f Dockerfile.slim -t korap/conllu-spacy:slim .
+	@echo "Slim build complete (without GermaLemma, saves ~180MB)"
+
 build-with-models:
 	docker build -f Dockerfile.with-models -t korap/conllu-spacy:with-models .