Yeah, with the web upload tools you linked to it's easiest now.
I set up my own ReaPack repo before these were available and upload my scripts there.
Just added this one, named "Bypass master volume envelope".
Note that my repo isn't enabled by default in ReaPack, so if you haven't done so already you must import it first to see my scripts:
https://github.com/nofishonfriday/ReaScripts
(see bottom)