Slack Dockerfile for 2.1.0

Dockerfile.slack

FROM debian:stretch

ENV LC_ALL en_US.UTF-8  
ENV LANG en_US.UTF-8

RUN apt-get update && apt-get install -y \  
    apt-transport-https \
    ca-certificates \
    curl \
    gconf2 \
    gconf-service \
    gvfs-bin \
    hunspell-en-us \
    libasound2 \
    libgtk2.0-0 \
    libnotify4 \
    libnss3 \
    libxss1 \
    libxtst6 \
    locales \
    python \
    xdg-utils \
        libgnome-keyring0 \
        gir1.2-gnomekeyring-1.0 \
        libappindicator1 \
    --no-install-recommends
    && rm -rf /var/lib/apt/lists/*

RUN echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen \  
    && locale-gen en_US.utf8 \
    && /usr/sbin/update-locale LANG=en_US.UTF-8

ADD ./slack-desktop-2.1.0-amd64.deb ./  
RUN dpkg -i slack-desktop-2.1.0-amd64.deb

ENTRYPOINT ["slack"] 

Hi
#27 line && will introduce docker build error.
#29 line has extra space after \, please help to fix it.

Add " **" to the end of line 26, like so "--no-install-recommends **", to be able to run it. Fixed it for me.

I am on:
OS: Mac OSX Seirra
zsh: zsh 5.2 (x86_64-apple-darwin16.0)
brew: Homebrew 1.1.10
docker: Docker version 1.13.1, build 092cba3

Hope it helps.