cirrus/gh: migrating Cirrus CI jobs to GitHub Actions

Cirrus CI is shutting down (https://cirruslabs.org/). It was a very good
CI service, very helpful for the project. We are moving our CI jobs that
were running there on GitHub Actions (GHA).

* FreeBSD job is removed, as no FreeBSD image is available on GHA
* Several Linux jobs are folded into existing GHA jobs to optimize the
  total number of CI jobs

This commit also rework the way to pass options to the configure script
to be able to handle value containing whitespace or shell-specific
characters.

Signed-off-by: Xavier Delaruelle <xavier.delaruelle@cea.fr>

Author: xdelaruelle