Rez package definition for MtoA

Tested with Arnold 5.3.2.1, mtoa 7.2.2.0.

name = "arnold_maya"

version = "7.2.2.0"

requires = [
    "arnold",
    "maya-2022.5"
]

def commands():
    root_folder = r"C:\MTOA\maya2022"
    
    env.PATH.prepend(fr"{root_folder}\bin")
    env.PYTHONPATH.prepend(fr"{root_folder}\scripts")
    
    env.MAYA_PLUG_IN_PATH.prepend(fr"{root_folder}\plug-ins")
    env.MAYA_SCRIPT_PATH.prepend(fr"{root_folder}\scripts\mtoa\mel")
    env.MAYA_CUSTOM_TEMPLATE_PATH.prepend(fr"{root_folder}\scripts\mtoa\ui\templates")
    env.MAYA_RENDER_DESC_PATH.prepend(root_folder)
    env.ARNOLD_PLUGIN_PATH.prepend(fr"{root_folder}\shaders")

And yes all variables need to be prepended, not just appended.