add version

Makefile

@@ -1,7 +1,8 @@
 .PHONY: clean test appjs docker push mock
 
 IMAGE            ?= hjacobs/kube-ops-view
-TAG              ?= latest
+VERSION          ?= 2017.0.dev1-$(shell git describe --tags --always --dirty)
+TAG              ?= $(VERSION)
 GITHEAD          = $(shell git rev-parse --short HEAD)
 GITURL           = $(shell git config --get remote.origin.url)
 GITSTATU         = $(shell git status --porcelain || echo "no changes")
@@ -19,7 +20,7 @@ appjs:
 	docker run -it -u $$(id -u) -v $$(pwd):/workdir -w /workdir/app node:7.4-alpine npm run build
 
 docker: appjs scm-source.json
-	docker build -t "$(IMAGE):$(TAG)" .
+	docker build --build-arg "VERSION=$(VERSION)" -t "$(IMAGE):$(TAG)" .
 
 push: docker
 	docker push "$(IMAGE):$(TAG)"