Added dockerfile

Dockerfile

+FROM instrumentisto/glide:0.13.1-go1.10 as builder
+RUN apk --update add gcc musl-dev
+WORKDIR /go/src/app
+COPY . .
+RUN glide install
+RUN go build -a app .
+
+FROM alpine:3.7
+WORKDIR /root/
+COPY --from=builder /go/src/app/app .
+CMD ["./app"]
\ No newline at end of file