Docker for mattermost in production

1. Put cert.pem into web/cert and key-no-password.pem into web/cert/private.
2. docker-compose up -d

The settings of the servers are based on
https://github.com/mattermost/platform/blob/master/doc/install/Production-Ubuntu.md.

app/config_docker.json is based on
https://raw.githubusercontent.com/mattermost/platform/master/config/config.json.

app/Dockerfile

@@ -0,0 +1,23 @@
+FROM ubuntu:14.04
+
+RUN apt-get update && apt-get -y upgrade && apt-get -y install wget
+RUN mkdir -p /mattermost/data
+
+RUN touch /etc/init/mattermost.conf
+RUN echo $'start on runlevel [2345]\n\
+stop on runlevel [016]\n\
+respawn\n\
+chdir /mattermost\n\
+exec bin/platform\n'\
+>> /etc/init/mattermost.conf
+
+RUN wget https://github.com/mattermost/platform/releases/download/v1.2.1/mattermost.tar.gz \
+	&& tar -xvzf mattermost.tar.gz && rm mattermost.tar.gz
+
+ADD config_docker.json /
+ADD docker-entry.sh /
+
+RUN chmod +x /docker-entry.sh
+ENTRYPOINT /docker-entry.sh
+
+EXPOSE 80