Simple Docker-based build option

This Dockerfile allows anyone with a recent version of Docker to quickly build a fully working Grafana container without any local build tooling. Pulling the sources from Git and calling `docker build .` is enough.

Dockerfile

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+FROM golang:1.9
+RUN go get -u github.com/golang/dep/cmd/dep
+WORKDIR $GOPATH/src/github.com/grafana/grafana
+COPY Gopkg.toml Gopkg.lock ./
+RUN dep ensure --vendor-only
+COPY pkg pkg
+RUN go install ./pkg/cmd/grafana-server
+RUN go install ./pkg/cmd/grafana-cli
+RUN strip $GOPATH/bin/grafana-server
+RUN strip $GOPATH/bin/grafana-cli
+
+FROM node:8
+WORKDIR /usr/src/app/
+COPY package.json yarn.lock ./
+RUN yarn install --frozen-lockfile
+ENV NODE_ENV production
+COPY . ./
+RUN yarn run build
+
+FROM debian:stretch-slim
+WORKDIR /app
+ENV PATH $PATH:/app/bin
+COPY --from=0 /go/bin/grafana-server ./bin/
+COPY --from=0 /go/bin/grafana-cli ./bin/
+COPY --from=1 /usr/src/app/public ./public
+COPY --from=1 /usr/src/app/tools ./tools
+COPY conf ./conf
+CMD ["grafana-server"]