danvratil/qcoro

CI: GCC 12 support

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Extend the matrix with GCC 12.

I couldn't find any PPA with gcc-12 for ubuntu 20.04 (used on the linux github runners), so we'll probably have to have a Docker image based on newer ubuntu with gcc 12 and necessary dev tools to build QCoro preinstalled.

Done, we now have a more sustainable and scalable way to add/remove clang and gcc compiler versions through custom Docker images.