Add dockerfile to build and run labench

Dockerfile

@@ -0,0 +1,11 @@
+FROM golang:alpine as builder
+RUN mkdir /builder
+RUN apk add --no-cache git
+ADD . /build/
+WORKDIR /build
+RUN go build
+FROM alpine
+COPY --from=builder /build/labench /app/
+COPY labench.yaml /app/
+WORKDIR /app
+CMD ["./labench"]