Exclude files under repos/ from being uploaded to Cloud Build
Exclude files under repos/ from being uploaded to Cloud Build

When submitting a Cloud Build job from the command line, we do not want to include files under repos/, which can amount to almost a Gig.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=244906528

google/nomulus,google/nomulus,google/nomulus,google/nomulus,google/nomulus,google/nomulus