Support to build multi-architecture images

Created by: pixiake

Signed-off-by: pixiake guofeng@yunify.com

What this PR does / why we need it:

Support to build multi-architecture images for ks-installer.

1. Add the detection and judgment of the environment architecture in the Dockerfile.
2. Adjust the pipeline of github action to support automatic multi-architecture images building for ks-installer.
3. Adjust the string for judging that the resource already exists. （AlreadyExists -> already exists）