Add these jobs to GHA:
- NetBSD, cmake-unity, clang, OpenSSL, x86_64, with tests, w/o python,
no parallelism (was flaky sometimes)
- OpenBSD, cmake-unity, clang, LibreSSL, x86_64, with tests,
with python, -j8, TFTP results ignored due to #13623.
- FreeBSD, cmake-unity and autotools, clang, OpenSSL, arm64
(Tests disabled for arm64, because they are slow. It's available for
x86_64 with python, -j12.)
Configuration matches our existing Cirrus CI one.
- OmniOS, autotools, gcc, OpenSSL, x86_64, with tests, -j12.
All build with websockets and examples.
Closes#13583