More x86-64 variants of container images

[nazar-pc]

This way we have not just Skylake build, but also x86-64-v2, x86-64-v3 and can have Zen4+ optimized builds (if runner would support it).

Follow-up to this will replace building of executables on host OS with extraction from container images, which will simplify CI pipeline and even reduce the time it takes to build everything (with a small caveat that we technically build more variants now, but we do it concurrently, but it should at least not be slower overall).

As a bonus it is now possible to cross-compile to x86-64, not just from. Not very practical without non-x86-64 runners, but hey, at least we have it.

CI run confirming successful operation: https://github.com/autonomys/subspace/actions/runs/11725994004/job/32663591077

Code contributor checklist:

• I have read, understood and followed contributing guide

[teor2345]

The changes look good, but I didn’t run the resulting executables.