WIP: Run npm via Docker

npm.sh

npm () {
    [ -n "$NODE_VERSION" ] || NODE_VERSION="latest"

    tty=
    tty -s && tty=--tty
    docker run \
        $tty \
        --interactive \
        --rm \
        --user $(id -u):$(id -g) \
        --volume /etc/passwd:/etc/passwd:ro \
        --volume /etc/group:/etc/group:ro \
        --volume $HOME/.npm:/.npm \
        --volume $(pwd):/app \
        --workdir /app \
        --entrypoint npm \
        "node:${NODE_VERSION}" "$@"
}