Remove some unnecessary steps from the build image

Go caches builds for different tags now, so we don't need to pre-build them.

We don't use `dep` any more.

Signed-off-by: Bryan Boreham <[email protected]>

Author: bboreham

build-image/Dockerfile

@@ -1,9 +1,6 @@
 FROM golang:1.13.3-stretch
 RUN apt-get update && apt-get install -y python-requests python-yaml file jq unzip protobuf-compiler libprotobuf-dev && \
 	rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-RUN go clean -i net && \
-	go install -tags netgo std && \
-	go install -race -tags netgo std
 RUN curl -fsSLo shfmt https://github.com/mvdan/sh/releases/download/v1.3.0/shfmt_v1.3.0_linux_amd64 && \
 	echo "b1925c2c405458811f0c227266402cf1868b4de529f114722c2e3a5af4ac7bb2  shfmt" | sha256sum -c && \
 	chmod +x shfmt && \
@@ -15,8 +12,6 @@ RUN GO111MODULE=on go get -tags netgo \
 		github.com/gogo/protobuf/[email protected] \
 		github.com/gogo/protobuf/[email protected] && \
 	rm -rf /go/pkg /go/src
-RUN curl -Ls https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64 -o $GOPATH/bin/dep && \
-  chmod +x $GOPATH/bin/dep
 COPY build.sh /
 ENV GOCACHE=/go/cache
 ENTRYPOINT ["/build.sh"]