我是这样配置的，不知道是否能帮到你！

root@R430 /e/r/k3s# cat registries.yaml 
mirrors:
  harbor.horon.top:
    endpoint:
      - "https://harbor.horon.top:8089"
configs:
  "harbor.horon.top:8089":
    auth:
      username: admin
      password: horon63163798
    tls:
      cert_file: /opt/harbor/certs.d/harbor.horon.top.cert
      key_file: /opt/harbor/certs.d/harbor.horon.top.key
      ca_file: /opt/harbor/certs.d/ca.crt