Zenodo is a service to create citations (as Digital Object Identifiers) for software, data, and other artifacts.
CERN, an OpenAIRE partner and pioneer in open source, open access and open data, provided this capability [Open Data policy/catch-all repository] and Zenodo was launched in May 2013.
Zenodo can sync with Github.
See https://coderefinery.github.io/github-without-command-line/doi/
Briefly
Tutorial instructions use sandbox.zenodo.org. When you're comfortable and want the real DOI, remove sandbox from the url.
Github releases can be deleted and recreated to initiate DOI (re)generation on the zenodo side