Use Rust for the cryptography python wheel

[lukaszczerpak]

Currently we use CRYPTOGRAPHY_DONT_BUILD_RUST=1 as a workaround to install pre-compiled cryptography wheel. This is only a temporary solution and long-term we should install Rust compiler. This will only be possible on Alpine 3.13+ that we cannot use today due to lack of node images.

[ynohat]

Reopening because we have switched to 3.13, but we still need to switch to rust.