I would encourage you not to use DOIs for software. They are not made for this, and have limitations which are not appropriate. Instead, use Software Heritage

I would encourage you not to use DOIs for software. They are not made for this, and have limitations which are not appropriate. Instead, use Software Heritage https://www.softwareheritage.org/ https://www.softwareheritage.org/ , it provides unique identifiers and actually understand repositories, versioning, history, etc. It also allows you to cite the software and even give proper, durable links to point to the code.