shithub: hugo

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Dockerfile: Reduce image size from 277MB to 27MB

"xtrem" awesome container size optimization
by using alpine:3.6 as base image
and by installing Go at build time.

See #3730 and #3738

--- a/Dockerfile

+++ b/Dockerfile

@@ -1,12 +1,21 @@

-FROM golang:alpine3.6

+FROM alpine:3.6

 ENV GOPATH /go

+ENV PATH $GOPATH/bin:$PATH

 RUN \

   adduser -h /site -s /sbin/nologin -u 1000 -D hugo && \

   apk add --no-cache \

-    dumb-init \

+    dumb-init && \

+  apk add --no-cache --virtual .build-deps \

+    gcc \

+    musl-dev \

+    go \

     git && \

+  mkdir -p \

+    ${GOPATH}/bin \

+    ${GOPATH}/pkg \

+    ${GOPATH}/src && \

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

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

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

@@ -13,7 +22,7 @@

   go install && \

   cd $GOPATH && \

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

-  apk del --no-cache git go

+  apk del .build-deps

 USER    hugo

 WORKDIR /site

@@ -22,4 +31,3 @@

 ENTRYPOINT ["/usr/bin/dumb-init", "--", "hugo"]

 CMD [ "--help" ]

-