crane: Can't be used with mTLS/CBA/ECP enabled accounts

[bluec0re]

Describe the bug

crane doesn't seem to support mTLS (ECP/CBA) for GCR. Seems like the decision to use a custom library implementation for interacting with the APIs instead of relying on google.golang.org/api is the culprit.

To Reproduce

Try to push or pull from gcr.io with an account enrolled in CBA.

Expected behavior

Using crane works as it used to.

Additional context

• Version: 0.20.6
• Registry used: GCR
• Account with CBA required
• Google API go package implementations:
  • https://github.com/googleapis/google-api-go-client/tree/v0.248.0/internal/cert
  • https://github.com/googleapis/google-api-go-client/blob/v0.248.0/internal/cba.go
  • https://github.com/googleapis/google-api-go-client/blob/v0.248.0/transport/http/dial.go#L39