Just do a super-minimal cleaning and upload to Zenodo or similar, then stick the DOI to the code and input/output files in your paper somewhere. 99% certain your reviewers will not brother to look at your code. 10 years from now someone new looking into the same topic gets a leg up. Don't feel obligated to update, clarify, or even think about the code ever again. If you want to build a community or something, then by all means go for github, but providing code along with your paper should be something automatic and quick, not adding an unwanted burden.