feat: Support ca bundle for registry in bootstrap

[gaocegege]

Describe the feature

# registry configures a new Docker register used for cache import or output.
[registry."docker.io"]
  # mirror configuration to handle path in case a mirror registry requires a /project path rather than just a host:port
  mirrors = ["yourmirror.local:5000", "core.harbor.domain/proxy.docker.io"]
  http = true
  insecure = true
  ca=["/etc/config/myca.pem"]
  [[registry."docker.io".keypair]]
    key="/etc/config/key.pem"
    cert="/etc/config/cert.pem"

Why do you need this feature?

No response

Additional context

No response