ORGANIC-467. Updated Dockerfile for build it slighlty faster.

Author: thomasyip

Dockerfile

@@ -2,10 +2,10 @@ FROM golang:1.11.2-alpine3.8
 
 ADD . /go/src/github.com/netlify/git-gateway
 
-RUN apk update && apk add wget && rm -rf /var/cache/apk/*
-
 RUN apk add --update alpine-sdk
 
+RUN rm -rf /var/cache/apk/*
+
 RUN go get github.com/Masterminds/glide
 
 RUN adduser -D -u 1000 netlify && cd /go/src/github.com/netlify/git-gateway && make deps build && mv git-gateway /usr/local/bin/