Add rocky8 and omega pipelines

Paal Kvammerequested to merge
kvamme62/osdu-rocky8-omega8-rb2 into master

Add support for rocky8 and omega in the OSDU build rules.

rocky8 binaries can be used for distros based on Red Hat 8 or CentOS 8.

omega is a special version of rocky8 where the c++ ABI uses the old definitions (pre-c++11) for std::string. This allows linking with legacy libraries that cannot be rebuilt. Google _GLIBCXX_USE_CXX11_ABI for details.

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