You know what? Just for you I will! It should be available now. I have never published for Linux before so please let me know if it works for you :)
So looks like Unity doesn't make a designated .sh file when building for Linux. If you set the file as executable and double click it it should work then. Otherwise you can try launching the .x86_64 file from the terminal. Let me know if this works and I can add a note of it in the game's description!