[EPIC] File system issues

[jonpugh]

Terra uses simple volume mounting to get your app's files into the container.

Right now this causes some problems with the UID:GID not aligning between the host and the container.

We need to resolve this before we can call terra "production ready".

This is especially a problem for the file system. The "nginx" user needs to be able to write to the "sites/default/files" folder, and right now, the only way to do that is to chmod 777 files on the host.

I'd love help or advice from @ergonlogic and @MatthewHager on this, because they already solved these kinds of problems with https://github.com/getvalkyrie