イメージのプルがエラーメッセージ "Source image rejected: A signature was required, but no signature exists" で失敗する

Issue

• air-gapped environment でのイメージのプルが、エラーメッセージ Source image rejected: A signature was required, but no signature exists が表示されて失敗します。

  Events:
  Type     Reason          Age                  From               Message
  ....
  Normal   Pulling         60s (x4 over 3m7s)   kubelet            Pulling image "registry.redhat.io/ocs4/ocs-operator-bundle@sha256:6b7a27b9f2c8ec7c1a32cffb1eaac452442b1874d0d8bacd242d8a66668337777"
  Warning  Failed          50s (x4 over 2m41s)  kubelet            Failed to pull image "registry.redhat.io/ocs4/ocs-operator-bundle@sha256:6b7a27b9f2c8ec7c1a32cffb1eaac452442b1874d0d8bacd242d8a66668337777": rpc error: code = Unknown desc = Source image rejected: A signature was required, but no signature exists