Official support for Ubuntu 22.04 on ARM64

[Fydon]

I see that Circle CI is already building for Ubuntu 22.04. However Ubuntu 20.04 is still the latest officially supported version according to the README and documentation. Also the AmazonEFSUtils Systems Manager Distributor doesn't support Ubuntu 22.04.

I can't see an ARM64 builds in Circle CI, but the documentation states that ARM64 is supported on earlier Ubuntu releases using AmazonEFSUtils. Therefore I assume that once Ubuntu 22.04 is supported that it will also work on ARM64.