Just run the miniforge install script if you want a very friction-free install. I'm not a big conda fan, but the "install in my home directory" use case is very well covered by miniforge.
https://github.com/conda-forge/miniforge/
Several years ago I used FEniCS mshr which wraps CGAL for Python, but I am unsure if is still maintained or if they went for a Gmsh wrapper instead, or abandoned the idea of constructive solid geometry from Python code completely. I have not followed FEniCS closely in the last few years.
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.