Graphics provider needs to be a path to a json file in the root of the
rootfs. Make sure to strip the filepath off to get the directory.
Misunderstood the assignment before.
Always enables FEXServer log thread when built for Steam so that clients
can be controlled with `STEAM_FEX_LOG=1`. FEX logs will then always go
to FEXServer and those can get directed to wherever pressure-vessel
chooses.