Docker image to build go from source

Dockerfile

FROM gcr.io/google-appengine/debian8:latest

# Install Go
RUN apt-get update \
    && apt-get install -y \
       curl \
       gcc \
       git \
       build-essential \
       ca-certificates \
       mercurial \
       --no-install-recommends \
    && rm -rf /var/lib/apt/lists/*

ENV GO_VERSION 1.8

RUN curl -sSL https://storage.googleapis.com/golang/go$GO_VERSION.linux-amd64.tar.gz -o /tmp/go.tar.gz && \
    CHECKSUM=53ab94104ee3923e228a2cb2116e5e462ad3ebaeea06ff04463479d7f12d27ca && \
    echo "${CHECKSUM}  /tmp/go.tar.gz" | sha256sum -c - && \
    tar -C /usr/local -vxzf /tmp/go.tar.gz && \
    rm /tmp/go.tar.gz && \
    mv /usr/local/go /usr/local/go1.8 && \
    git clone https://github.com/43b/go.git /usr/local/go && \
    cd /usr/local/go/src && \
    git checkout go1.8 && \
    GOROOT_BOOTSTRAP=/usr/local/go1.8 ./make.bash --no-clean 2>&1 && \
    rm -r /usr/local/go1.8

ENV PATH /go/bin:/usr/local/go/bin:$PATH
ENV GOPATH /go:/go/src/app/_gopath

RUN ln -s /go/src/app /app
WORKDIR /go/src/app

LABEL go_version=$GO_VERSION