Linux isn't and will probably never be officially supported, but I can confirm that Forever runs flawlessly under WINE on most popular Linux distros (as of writing, Forever is confirmed to run WINE 11.11, on Linux kernel 7.0.13)
I mentioned in terms of official support by I already kind of knew about the whole.It runs on wine pretty well.I actually hope that the catto boi collection on steam actually gets better linux support even if just lightly
