Hope to support configuration pull for all insecure repositories

[kycheng]

Similar to the effect of docker manifeact --insecure, when --insecure is set, both insecure and secure can be handled correctly.

When I build, my dependency repositories are insecure and I have to do a separate configuration

insecure-entitlements = [ "network.host", "security.insecure" ]

[registry."insecure.com"]
  http = true
  insecure = false

If it is docker, it can be configured like this

  "insecure-registries": [
    "0.0.0.0/0"
  ],

I apply the buildkit to the pipeline(CI), there is no way to predict all the insecure repositories.