Add auto-tag

Makefile

+IMAGE := k8r.eu/justjanne/$(shell basename $(shell git remote get-url origin) .git)
+TAGS := $(shell git describe --always --tags HEAD)
+
+.PHONY: build
+build:
+	docker build --pull -t $(IMAGE):$(TAGS) .
+	docker tag $(IMAGE):$(TAGS) $(IMAGE):latest
+	@echo Successfully tagged $(IMAGE):$(TAGS) as latest
+
+.PHONY: push
+push: build
+	docker push $(IMAGE):$(TAGS)
+	docker push $(IMAGE):latest
+	@echo Successfully pushed $(IMAGE):$(TAGS) as latest