shithub: hugo

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Dockerfile: Run go install with -ldflags '-s -w'

This reduce the Docker image size from 27 MB to 20.5 MB.

--- a/Dockerfile

+++ b/Dockerfile

@@ -19,7 +19,8 @@

   go get github.com/kardianos/govendor && \

   govendor get github.com/gohugoio/hugo && \

   cd $GOPATH/src/github.com/gohugoio/hugo && \

-  go install && \

+  rm -f $GOPATH/bin/hugo && \

+  go install -ldflags '-s -w' && \

   cd $GOPATH && \

   rm -rf pkg src .cache bin/govendor && \

   apk del .build-deps