Fix alpine ecr image pull (#62413)
Summary:
Fixes alpine ecr image pull in the render_test_result step
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62413
Reviewed By: malfet
Differential Revision: D29990844
Pulled By: zhouzhuojie
fbshipit-source-id: ff420f57d5e4b80d0ebf73508001a127649e9eb2
