Buildfarm fix

[troygibb]

Description

Attempt number one of trying to fix the following error:

15:21:59 1:         if not os.access(self._replay_directory, os.W_OK):
15:21:59 1: >           raise PermissionError(f'No write permission for directory: {self._replay_directory}')
15:21:59 1: E           PermissionError: No write permission for directory: /tmp/replay_testing

Need some env variable to figure out if we're in the buildfarm or not. Generally it is more useful to dump replay assets in /tmp but we'll see how this goes.