ARM64 Architecture doesn't trigger the ARM64 worker environment

[nagathodupu]

On Travis, if no architecture is provided then OS/Arch: Linux/amd64 will be as default, But if we define the architecture as ARM64 it needs to build the working environment with ARM64 but here it automatically chooses the AMD64 as the working environment.

Here is the sample format of the configuration I'm working on:

• services: docker
  python: 3.8
  os: linux
  dist: focal
  name: arm64-linux
  arch: arm64
  env:
  - CIBW_BUILD="cp38-manylinux_aarch64"
  - CIBW_ARCHS="aarch64"

• Do we need to change any settings on the Travis to enable the build feature for the different architecture?

  TIA