Add KuberayTestArch environment variable for architecture override in… #4348
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… tests
This commit introduces a new environment variable KuberayTestArch that allows overriding the detected architecture in test environments. Previously, the system only relied on runtime.GOARCH to determine if ARM64 architecture was being used, but this change enables explicit architecture specification through the environment variable. This is particularly useful for testing scenarios where you want to force a specific architecture regardless of the actual runtime environment, improving test flexibility and consistency across different platforms.
Why are these changes needed?
Related issue number
to #4346
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