www-data not being added to group set by -e PGID=<host_gid>

[ubergeek77]

After installing this container and setting ownCloud up, the first login gave me an error message, saying "Could not write to "config" directory." The webserver runs as www-data, but it looks like either the config directory wasn't set to the GID set by -e PGID, or www-data wasn't added to that group ID. Logging in and manually adding www-data to the group fixed the issue. I should mention that I have /data and /config mounted as folders on the host, so due to permission conflicts, I needed to specify the UID and GID when the container was created.

Otherwise, this container has been great. Thank you for making an all-in-one container without the need for any external databases, and one that supports manually setting PUID and PGID - I had a lot of trouble with the official containers without being able to set those.