Getting large amounts of "Unauthenticated request." errors when using GCP Batch.

[vedantroy-genmo]

Task Name: rw-id3779-task4000-par4000-stage0-download.

Task UID:  rw-id3779-task4000-637b650e-07c4-429d0.

1942 succeeded, 2056 tasks failed, 2 running. (Total 4K tasks).

I'm getting a lot of errors of the form:
```

docker: Error response from daemon: Head "https://us-central1-docker.pkg.dev/v2/${my_project}/gcpbatch-us-central1/${my_repo}/manifests/latest": denied: Unauthenticated request. Unauthenticated requests do not have permission "artifactregistry.repositories.downloadArtifacts" on resource "projects/${my_project}/locations/us-central1/repositories/gcpbatch-us-central1" (or it may not exist).

```