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Paweł Gronowski 78c2aa4fcc gha/dco: Pass origin branch
The DCO job runs inside an Alpine container and fetches the base
branch from VALIDATE_REPO unless VALIDATE_ORIGIN_BRANCH is set.

In forked runs that repository can point at a private upstream URL, so
the unauthenticated fetch fails with:

```
fatal: could not read Username for 'https://github.com': No such
device or address
```

Pass the pull request base SHA so the validator can resolve the
comparison point locally.

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
2026-06-25 17:17:19 +02:00
..
2026-06-25 17:17:19 +02:00
2022-08-29 19:53:04 +02:00
2021-06-01 23:48:32 +00:00
2025-10-06 14:43:30 -05:00