PyMel missing preferences in Docker Maya

I’m getting warnings maya/2018/prefs is missing when I use PyMel in Docker Maya. Just curious how I can help it find these preference files and possibly add my own preferences (like auto-load Arnold). Docker is on Centos and I’m on Mac.

pymel.core : INFO : Updating pymel with pre-loaded plugins: renderSetup
pymel.internal.startup : WARNING : Maya startup file /root/maya/2018/prefs/userPrefs.mel does not exist
Warning: file: /usr/autodesk/maya2018/bin/../scripts/startup/initialStartup.mel line 179: Y-axis is already the Up-axis
AbcExport v1.0 using Alembic 1.5.8 (built Dec 24 2015 17:39:02)
AbcImport v1.0 using Alembic 1.5.8 (built Dec 24 2015 17:39:02)
pymel.internal.startup : WARNING : Maya startup file /root/maya/2018/prefs/userNamedCommands.mel does not exist
pymel.internal.startup : WARNING : Maya startup file /root/maya/2018/prefs/pluginPrefs.mel does not exist