Update devfile registry to support arm64 architecture

[Jdubrick]

Which area/kind this issue is related to?

/area registry

Issue Description

This issue is to alter scripts in the devfile registry repo to accommodate changes made to the registry-viewer from #1356. To solve the mentioned issue an environment variable was implemented to allow the user to change the architecture the container image was built for.

In order to fix this issue we have to edit the .ci/build_and_deploy.sh script that clones devfile-web and make sure the environment variable required by the devfile-web scripts is set if the user wants to use a different architecture.

Steps Required:

1. Review https://github.com/devfile/devfile-web/blob/main/CONTRIBUTING.md#Troubleshooting and https://github.com/devfile/devfile-web/blob/main/scripts/build_viewer.sh to familiarize yourself with the PLATFORM_EV variable that needs to be set
2. Edit https://github.com/devfile/registry/blob/main/.ci/build_and_deploy.sh to support the PLATFORM_EV variable being set and exported into the directory where devfile-web is being cloned
3. Update documentation to reflect the use of PLATFORM_EV for users who do not want to use the default linux/amd64 architecture (primarily M1/M2/M3 mac users)