Need to add FreeBSD CI

[BoboTiG]

This is not currently doable on Travis CI. Perhaps should we use another server only for that.

[BoboTiG]

We should have a look to https://cirrus-ci.org/guide/FreeBSD/.

[evilham]

Another suggestion: https://builds.sr.ht/

[BoboTiG]

@danilobellini I reopen the issue until we found a way to add the repos to Cirrus-CI.

[kurtmckee]

It appears that a FreeBSD VM could be used in GitHub Actions:

https://github.com/vmactions/freebsd-vm

If this is a workable solution, Cirrus CI could be removed as a CI environment.

[BoboTiG]

If this is a workable solution, Cirrus CI could be removed as a CI environment.

That would be great!