Join Webex meeting in Docker without messing your system

webex.dockerfile

FROM ioft/i386-ubuntu:16.04
#FROM ubuntu:xenial

## Arguments
ARG user=filip
ARG user_uid=1000
ARG locale=cs_CZ.UTF-8
ARG jre_url=http://download.oracle.com/otn-pub/java/jdk/8u102-b14/jre-8u102-linux-i586.tar.gz

ENV RUN_USER $user
ENV RUN_USER_UID $user_uid
ENV JRE_URL $jre_url
ENV DEBIAN_FRONTEND noninteractive

RUN apt-get update && apt-get install -y \
    wget \
    firefox:i386 \
    libcanberra-gtk-module:i386 \
    gtk2-engines-murrine:i386 \
    libxtst6:i386 \
    libgl1-mesa-glx \
    dbus-x11 \
    pulseaudio \
    dmz-cursor-theme \
    light-themes

RUN update-alternatives --set x-cursor-theme /usr/share/icons/DMZ-White/cursor.theme

RUN useradd -u ${RUN_USER_UID} -m ${RUN_USER} && \
    adduser ${RUN_USER} audio && \
    adduser ${RUN_USER} video

# Install 32bit java
RUN wget -O- --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "${JRE_URL}" | tar xvzf - -C /opt && \
    mkdir -p /home/${RUN_USER}/.mozilla/plugins && \
    ln -sfv /opt/jre*/lib/i386/libnpjp2.so /home/${RUN_USER}/.mozilla/plugins/

RUN locale-gen cs_CZ.UTF-8 && \
    locale-gen en_US.UTF-8

# Hack to have same behavior as on Debian Jessie
RUN rm -rf /var/run && \
    ln -s /run /var/run

# Cleanup
RUN apt-get clean
RUN rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /run/*

# App execution itself
USER ${RUN_USER}
ENV HOME /home/${RUN_USER}

# These env variables should be overwritten on container execution
ENV DISPLAY unix:0.0
ENV XDG_RUNTIME_DIR /run/user/$user_uid
ENV LC_ALL $locale

# Set theme
RUN echo 'include "/usr/share/themes/Ambiance/gtk-2.0/gtkrc"' > $HOME/.gtkrc-2.0
RUN mkdir -p $HOME/.config/gtk-3.0 && \
    echo "[Settings]\ngtk-theme-name = Ambiance\ngtk-fallback-icon-theme = gnome" > $HOME/.config/gtk-3.0/settings.ini

WORKDIR $HOME
ENTRYPOINT ["/usr/bin/firefox", "https://www.webex.com/go/attend-meeting"]