Create Docker image with Alpine 3.9 + Golang 1.12.9 + Node.js 10.16.3

Dockerfile

FROM node:10.16.3-alpine

# Golang From: https://github.com/docker-library/golang/blob/master/1.12/alpine3.10/Dockerfile
RUN apk add --no-cache \
    ca-certificates

# set up nsswitch.conf for Go's "netgo" implementation
# - https://github.com/golang/go/blob/go1.9.1/src/net/conf.go#L194-L275
# - docker run --rm debian:stretch grep '^hosts:' /etc/nsswitch.conf
RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf

ENV GOLANG_VERSION 1.12.9

RUN set -eux; \
    apk add --no-cache --virtual .build-deps \
    bash \
    gcc \
    musl-dev \
    openssl \
    go \
    ; \
    export \
    # set GOROOT_BOOTSTRAP such that we can actually build Go
    GOROOT_BOOTSTRAP="$(go env GOROOT)" \
    # ... and set "cross-building" related vars to the installed system's values so that we create a build targeting the proper arch
    # (for example, if our build host is GOARCH=amd64, but our build env/image is GOARCH=386, our build needs GOARCH=386)
    GOOS="$(go env GOOS)" \
    GOARCH="$(go env GOARCH)" \
    GOHOSTOS="$(go env GOHOSTOS)" \
    GOHOSTARCH="$(go env GOHOSTARCH)" \
    ; \
    # also explicitly set GO386 and GOARM if appropriate
    # https://github.com/docker-library/golang/issues/184
    apkArch="$(apk --print-arch)"; \
    case "$apkArch" in \
    armhf) export GOARM='6' ;; \
    x86) export GO386='387' ;; \
    esac; \
    \
    wget -O go.tgz "https://golang.org/dl/go$GOLANG_VERSION.src.tar.gz"; \
    echo 'ab0e56ed9c4732a653ed22e232652709afbf573e710f56a07f7fdeca578d62fc *go.tgz' | sha256sum -c -; \
    tar -C /usr/local -xzf go.tgz; \
    rm go.tgz; \
    \
    cd /usr/local/go/src; \
    ./make.bash; \
    \
    rm -rf \
    # https://github.com/golang/go/blob/0b30cf534a03618162d3015c8705dd2231e34703/src/cmd/dist/buildtool.go#L121-L125
    /usr/local/go/pkg/bootstrap \
    # https://golang.org/cl/82095
    # https://github.com/golang/build/blob/e3fe1605c30f6a3fd136b561569933312ede8782/cmd/release/releaselet.go#L56
    /usr/local/go/pkg/obj \
    ; \
    apk del .build-deps; \
    \
    export PATH="/usr/local/go/bin:$PATH"; \
    go version

ENV GOPATH /go
ENV PATH $GOPATH/bin:/usr/local/go/bin:$PATH

RUN mkdir -p "$GOPATH/src" "$GOPATH/bin" && chmod -R 777 "$GOPATH"
WORKDIR $GOPATH