I would love a possibility to create unlisted repositories.

It should work exactly like a public repository, but it shouldn't be visible on any listings (like private repositories are). The only way to reach it would be to get a link from the owner (or guess / brute-force it). So basically similar to YouTube unlisted videos.

I've searched for such functionality on github/bitbucket/gitlab but it doesn't seem to be available.

I'm creating programming tasks for my students and want to provide solutions as git repositories. If I use public repositories they can easily search for solutions for future exercises. Private repositories require me to add them one-by-one to have read access.

I've seen 2 closed issues (#2230, #4095) about this, I hope the reason they was closed was lack of explanation.