Fix alpine image (#58462)
Summary:
Fixes dockerhub rate limiting issue, use the ECR image instead.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58462
Reviewed By: malfet
Differential Revision: D28510603
Pulled By: zhouzhuojie
fbshipit-source-id: 2cac59da1d1efdf31df71e9f76d802f8e9a0bfd5
