Summary:
The `manylinux` Docker image contains both the x64 and arm64 versions. So let's
try build the arm64 linux binary too.

Note there is [no `ubuntu-arm-latest`](https://github.com/orgs/community/discussions/148648#discussioncomment-11858287).

Reviewed By: muirdm

Differential Revision: D75883597

fbshipit-source-id: 1dd9a216f7e15aaf45ef0fa0fa68726e45252f3f