Installs roundcube 1.1.1 inside a docker container.

The installation may be used on your server, but also as a standalone IMAP client (if you skip the step 1. below).

Steps:

1. Customize roundcube/config.inc.php. If the file is unmodified, Roundcube will show a generic login page where the user can specify IMAP server.
2. Launch sudo ./start.sh to create roundcube image and start it with port forwarding at 127.0.0.1:8081. You may use LISTEN and PORT env. variables to change the default listening address and port.
3. Update your web server to proxy connections.

The SQLite database for contacts, settings, etc. is kept in /rc inside roundcube-data container. Even if you delete roundcube container, the database will persist in it.