Add FreeBSD 14 and 15 to Cirrus CI

[Thomasdezeeuw]

No description provided.

[Thomasdezeeuw]

We'll have to update the branch protection settings when merging this.

[Darksonn]

branch protection settings updated

[asomers]

This looks reasonable, but there's one sticky problem. Rustc sometimes segfaults on FreeBSD 13.4 and 13.5. It's unfortunately a Heisenbug that has defied solutions. So you might want to leave CI for FreeBSD 13 on 13.2 or 13.3. At least until April 2026, when FreeBSD 13 will officially be EoL. Or you could leave it out entirely. I'm not aware of any changes in FreeBSD 14's ABI that should affect Mio.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285873

[Thomasdezeeuw]

Thanks for the info @asomers. Since we deal with a lot of targets that "randomly" fail for various reasons out side of Mio I think it's ok to keep it.