This is the official 3rd party repo for LibreELEC. Do not install this manually. Install from the LibreELEC repo, under add-on repositories.
This repo has a github workflow set up to package and publish the addons, and update the addons.xml and the relevant md5 files after each commit/merge. Simply PR changes to the addons, and make sure the version in the addon's addon.xml is incremented to force packaging and publishing of the new version. There is no longer any need to run the addons_xml_generator.py script locally.