oc-mirror v2 (OCP 4.21) fails when running in containerized environments with arbitrary user IDs, specifically OpenShift CI. The failure occurs during the sigstore signature preparation phase with the following error: `[Executor] error getting the default registryd config path : unable to determine the current user : user: unknown userid 1003650000`

    Starting from Feb 04's (OCP v4.21 GA'd): https://mirror.openshift.com/pub/openshift-v4/amd64/clients/ocp/latest/oc-mirror.tar.gz

    Always

    In Prow CI environment, follow steps: https://github.com/openshift/release/blob/93e8fa82775a0ab6a81e85acccbd2e32e332360e/ci-operator/step-registry/cert-manager/install/catalog/cert-manager-install-catalog-commands.sh#L103-L128
    
    See job runs history: https://prow.ci.openshift.org/job-history/gs/test-platform-results/logs/periodic-ci-openshift-kueue-operator-release-1.2-test-e2e-disconnected

    Example logs:
    - https://gcsweb-ci.apps.ci.l2s4.p1.openshiftapps.com/gcs/test-platform-results/logs/periodic-ci-openshift-kueue-operator-release-1.2-test-e2e-disconnected/2023926586687885312/artifacts/test-e2e-disconnected/cert-manager-install-catalog/build-log.txt
    - https://gcsweb-ci.apps.ci.l2s4.p1.openshiftapps.com/gcs/test-platform-results/logs/periodic-ci-openshift-kueue-operator-release-1.2-test-e2e-disconnected/2018852900784050176/artifacts/test-e2e-disconnected/cert-manager-install-catalog/build-log.txt

    oc-mirror fails immediately with "unknown userid" error when the process UID doesn't exist in `/etc/passwd`, which is common in containerized environments where processes run with dynamically assigned UIDs for security purposes.

    oc-mirror should work in containerized environments regardless of the UID, falling back to ENV variables and system defaults when user database lookups fail.