I understand you can put custom Python scripts in
scripts/startup/ and they will be executed upon starting Blender.
However, I need to store my script outside of the Blender installation. With other software, such as Maya and Nuke, I can define an environment variable which will make those apps look for a script in a custom location and execute it during startup. Does Blender have anything like that?
EDIT: I can't open up the Blender UI and change options that way... as I'm talking about a deploy of Blender on many machines in a company. Therefore it has to be something which happens during the startup of Blender.