[BE][ghexport] support multiple repos

[PaliC]

Stack from ghstack (oldest at bottom):

• -> #3022

Differential Revision: D56070351

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3022

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:white_check_mark: No Failures

As of commit f8d6c58f8bc3c60ca389f99f4d7c4d6d530e755a with merge base 6e431355a554e5f84c3a05dfa2b981ead90c2b48 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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This pull request was exported from Phabricator. Differential Revision: D56070351

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This pull request was exported from Phabricator. Differential Revision: D56070351