Mailcow: Make compatible with Minikube.

Change-Id: I4682e4ae715052f101d382f1b384caa357fac1ce
diff --git a/makefile b/makefile
index ee955d7..44f6f85 100644
--- a/makefile
+++ b/makefile
@@ -37,20 +37,20 @@
 #
 # Takes ~240 seconds (nextcloud image):
 #
-#   $(IMAGES):
-#   	$(NIX_DOCKER) sh -c '$$(nix-build images.nix -A $@.streamed)' | $(DOCKER) load
+#%.load: images.nix
+#	$(NIX_DOCKER) sh -c '$$(nix-build --no-out-link images.nix -A $(patsubst %.load,%,$@).streamed)' | $(DOCKER) load
 #   
 # Takes ~60 seconds (nextcloud image):
 #
-#   $(IMAGES):
-#   	$(NIX_DOCKER) sh -c 'cat $$(nix-build images.nix -A $@.layered)' | $(DOCKER) load
+#%.load: images.nix
+#	$(NIX_DOCKER) sh -c 'cat $$(nix-build --no-out-link images.nix -A $(patsubst %.load,%,$@).layered)' | $(DOCKER) load
 #
 # The final approach takes ~20 seconds to build the nextcloud image.
 
 # Builds a Docker image as a .bin file that you can load with 'docker
 # load'.
 %.bin: images.nix
-	$(NIX_DOCKER) sh -c 'cp $$(nix-build images.nix -A $(patsubst %.bin,%,$@).layered) $@'
+	$(NIX_DOCKER) sh -c 'cp $$(nix-build --no-out-link images.nix -A $(patsubst %.bin,%,$@).layered) $@'
 
 # Builds and loads a Docker image into your local Docker daemon.
 %.load: %.bin