.github: Switch alpine to ECR image instead (#57060)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57060
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>
Test Plan: Imported from OSS
Reviewed By: walterddr
Differential Revision: D28040144
Pulled By: seemethere
fbshipit-source-id: f7590256c9f067add5d5e7b61a2c44beb2482d71
