Convenient cross-compilation, CUDA in aarch64 container image

[nazar-pc]

Major improvements:

• Cross-compilation no longer requires separate Dockerfiles (which is why they are removed), both native and cross-compilation is supported with a single file
• Container image is now built as multi-platform, meaning no -aarch64 suffix and no awkwardness related to that
• Aarch64 farmer container image is now compiled with CUDA support (while regular executable isn't)

Minor improvements:

• Base image is Ubuntu 22.04 instead of 20.04 (was needed for CUDA packages on aarch64 and we were planning to increase minimum version to 22.04 anyway, will do the same for CLI later)
• Updated versions of GitHub Actions related to container image building
• CARGO_NET_GIT_FETCH_WITH_CLI was a workaround for Cargo eating all RAM during aarch64 build under Docker on x86-64 rust-lang/cargo#10583 that with recent-ish improvements and gitoxide usage is no longer necessary

Ignore whitespaces during review, the diff is smaller and clearer that way

Code contributor checklist:

• I have read, understood and followed contributing guide

[nazar-pc]

@jim-counter @randywessels @EmilFattakhov FYI to update (simplify) docs