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Dockerfile: Switch to mage builds, various optimizations

- Use Alpine for both stages for consistency.
- Switch to mage from go install as dictated in the latest docs.
- Easy switch to building Hugo Extended by directly setting HUGO_BUILD_TAGS flag at image build time: `docker build --build-arg HUGO_BUILD_TAGS=extended .`
- Update to Go 1.13 and Alpine 3.10.
- The only possibly breaking change: Moved the `hugo` binary in the final stage from /hugo to /usr/bin/hugo so one can simply run `hugo` without having to search around for its location.

--- a/Dockerfile

+++ b/Dockerfile

@@ -2,32 +2,44 @@

 # Twitter:      https://twitter.com/gohugoio

 # Website:      https://gohugo.io/

-FROM golang:1.11-stretch AS build

+FROM golang:1.13-alpine AS build

+# Optionally set HUGO_BUILD_TAGS to "extended" when building like so:

+#   docker build --build-arg HUGO_BUILD_TAGS=extended .

+ARG HUGO_BUILD_TAGS

+ARG CGO=1

+ENV CGO_ENABLED=${CGO}

+ENV GOOS=linux

+ENV GO111MODULE=on

+

 WORKDIR /go/src/github.com/gohugoio/hugo

-RUN apt-get install \

-    git gcc g++ binutils

+

 COPY . /go/src/github.com/gohugoio/hugo/

-ENV GO111MODULE=on

-RUN go get -d .

-ARG CGO=0

-ENV CGO_ENABLED=${CGO}

-ENV GOOS=linux

+# gcc/g++ are required to build SASS libraries for extended version

+RUN apk update && \

+    apk add --no-cache gcc g++ musl-dev && \

+    go get github.com/magefile/mage

-# default non-existent build tag so -tags always has an arg

-ARG BUILD_TAGS="99notag"

-RUN go install -ldflags '-w -extldflags "-static"' -tags ${BUILD_TAGS}

+RUN mage hugo && mage install

 # ---

-FROM alpine:3.9

-RUN apk add --no-cache ca-certificates

-COPY --from=build /go/bin/hugo /hugo

-ARG  WORKDIR="/site"

-WORKDIR ${WORKDIR}

-VOLUME  ${WORKDIR}

-EXPOSE  1313

-ENTRYPOINT [ "/hugo" ]

-CMD [ "--help" ]

+FROM alpine:3.10

+

+COPY --from=build /go/bin/hugo /usr/bin/hugo

+

+# libc6-compat & libstdc++ are required for extended SASS libraries

+# ca-certificates are required to fetch outside resources (like Twitter oEmbeds)

+RUN apk update && \

+    apk add --no-cache ca-certificates libc6-compat libstdc++

+

+VOLUME /site

+WORKDIR /site

+

+# Expose port for live server

+EXPOSE 1313

+

+ENTRYPOINT ["hugo"]

+CMD ["--help"]