.circleci: Prefix intermediate build image tags (#62610)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62610
Prefixes intermediate build image tags with build- so that ECR lifecycle
policies can automatically clean them up
Policy to automatically cleanup images prefixed with `build-`: https://github.com/fairinternal/ossci-infra/commit/b02dd818f955a5f754bb22bade1307e6bc322ae3
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>
Test Plan: Imported from OSS
Reviewed By: walterddr
Differential Revision: D30055952
Pulled By: seemethere
fbshipit-source-id: 328b9c94ffc02877d088d0118a19c732f580838b
