Add dedicated linux/arm64 runner

[alvarobartt]

What does this PR do?

This PR adds a dedicated linux/arm64 runner to prevent QEMU emulation of linux/arm64 from linux/amd64, as it's slower and it's leading to some consistency issues with the sccache when building Dockerfile-cuda with CUDA_COMPUTE_CAP 121.

Additionally, the platform emulation is slow, hence it's not ideal either, as the builds where taking ~1 hour more than on linux/amd64 on both CPU and CUDA.

Thanks @glegendre01 for providing and configuring such runner!

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• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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