feat(docker): add Docker support and env example

Makefile

@@ -0,0 +1,20 @@
+REGISTRY	?= git.sakamoto.best/lolz
+IMAGE_NAME	?= auto-stars
+TAG			?= $(shell git rev-parse --short HEAD)
+IMAGE		:= $(REGISTRY)/$(IMAGE_NAME)
+CONTEXT		?= source
+DOCKERFILE	?= Dockerfile
+
+.PHONY: all build push clean
+
+all: push
+
+build:
+	docker build -f $(DOCKERFILE) -t $(IMAGE):$(TAG) -t $(IMAGE):latest $(CONTEXT)
+
+push: build
+	docker push $(IMAGE):$(TAG)
+	docker push $(IMAGE):latest
+
+clean:
+	-docker rmi $(IMAGE):$(TAG) $(IMAGE):latest