Mailcow: Move to Nix and Docker-Compose.
diff --git a/makefile b/makefile
new file mode 100644
index 0000000..a4ca869
--- /dev/null
+++ b/makefile
@@ -0,0 +1,41 @@
+RM_F = rm -f
+
+DOCKER = docker
+NIX_DOCKER = $(DOCKER) run --rm --mount source=type=volume,source=nix,target=/nix --volume $$(pwd):$$(pwd) --workdir $$(pwd) nixos/nix
+
+#NIX_BUILD = vctl run -it --rm --volume $$(pwd)/nix:/nix --volume $$(pwd):$$(pwd) --workdir $$(pwd) nixos/nix nix-build
+NIX_BUILD = $(NIX_DOCKER) nix-build
+NIX_BUILD_OUT = $(NIX_DOCKER) sh -c '$$(nix-build)'
+
+IMAGES = mailcow nano nextcloud prosody samba vim webcron
+IMAGES_BIN = $(patsubst %,%.bin,$(IMAGES))
+IMAGES_LOAD = $(patsubst %,%.load,$(IMAGES))
+
+.PHONY: all images clean #$(IMAGES_LOAD)
+
+all: images
+
+clean:
+ $(RM_F) $(IMAGES_BIN)
+
+images: $(IMAGES_LOAD)
+
+# The following approaches were all considered and discarded:
+#
+# Takes ~240 seconds (nextcloud image):
+#
+# $(IMAGES):
+# $(NIX_DOCKER) sh -c '$$(nix-build images.nix -A $@.streamed)' | $(DOCKER) load
+#
+# Takes ~60 seconds (nextcloud image):
+#
+# $(IMAGES):
+# $(NIX_DOCKER) sh -c 'cat $$(nix-build images.nix -A $@.layered)' | $(DOCKER) load
+#
+# The final approach takes ~20 seconds to build the nextcloud image.
+
+%.bin: images.nix
+ $(NIX_DOCKER) sh -c 'cp $$(nix-build images.nix -A $(patsubst %.bin,%,$@).layered) $@'
+
+%.load: %.bin
+ $(DOCKER) load --input=$<