make subtree "split" overhaul

In order to create cleaner histories we should be using subtree split
and push in order to preview the changes as an MR before pushing to
main.

.gitlab/make/docker.makefile

@@ -0,0 +1,29 @@
+.PHONY: docker-init
+docker-init:
+	@touch VERSION
+	@touch IMAGE
+
+.PHONY: buildx-context
+buildx-context:
+	docker buildx create --name container-builder --use --platform linux/amd64,linux/arm64
+
+.PHONY: buildx-clear
+buildx-clear:
+	docker buildx rm container-builder
+
+.PHONY: build
+build:
+	docker buildx build --load . -t $(IMAGE)
+	@docker buildx build --load . -t $(IMAGE_LATEST)
+
+.PHONY: push
+push:
+	-make buildx-clear
+	@make buildx-context
+	docker buildx build --platform linux/amd64,linux/arm64 --push . -t $(IMAGE)
+	@docker buildx build --platform linux/amd64,linux/arm64 --push . -t $(IMAGE_LATEST)
+
+.PHONY: docker-release
+docker-release:
+	@yq e ".services.minecraft.image = \"$(IMAGE)\"" -i docker-compose.yaml
+	@make push