Modify DockerFile for non-Linux users (#25)

Signed-off-by: soniasingla <[email protected]>

Author: soniasingla

Dockerfile

@@ -1,6 +1,16 @@
+FROM golang:1.14.2-alpine3.11 as builder
+WORKDIR $GOPATH/src/github.com/thanos-io/thanosbench
+# Change in the docker context invalidates the cache so to leverage docker
+# layer caching, moving update and installing apk packages above COPY cmd
+# More info https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#leverage-build-cache
+RUN apk update && apk upgrade && apk add --no-cache alpine-sdk
+# Replaced ADD with COPY as add is generally to download content form link or tar files
+# while COPY supports the basic copying of local files into the container.
+# https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#add-or-copy
+COPY . $GOPATH/src/github.com/thanos-io/thanosbench
+RUN git update-index --refresh; make build
+# -----------------------------------------------------------------------------
 FROM quay.io/prometheus/busybox:latest
 LABEL maintainer="The Thanos Authors"
-
-COPY thanosbench /bin/thanosbench
-
-ENTRYPOINT [ "/bin/thanosbench" ]
+COPY --from=builder /go/src/github.com/thanos-io/thanosbench/thanosbench /bin/thanosbench
+ENTRYPOINT [ "/bin/thanosbench" ]