Thanks so much @patdavid for the showcase my styles and everyone else for the comments and support! 
I don’t know any public repo with darktable styles on github, the only thing similar is https://dtstyle.net, like @andabata did pointed out, and I have uploaded some over there, but that site is a bit of a mess.
Currently my styles are in a private git repo, I’m planning to cloning it to github soon, before a new version I’m about to release.