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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>