Shared CN in CA and server certs

## Environment

* Operating system (including version): podman container (base image is Python: 3.9)
* mkcert version (from `mkcert -version`): 1.4.4
* Server (where the certificate is loaded): localhost:4336
* Client (e.g. browser, CLI tool, or script): localhost:3386

## What you did

mkcert identifier.local identifier localhost 0.0.0.0 127.0.0.1 ::1

## What went wrong

`2022/07/01 00:36:24 [info] 4#4: *1 SSL_do_handshake() failed (SSL: error:14094418:SSL routines:ssl3_read_bytes:tlsv1 alert unknown ca:SSL alert number 48) while SSL handshaking, client: 127.0.0.1, server: 0.0.0.0:443`

I'm running two independent services inside of a podman pod; the client referenced in the error message talks to the server for data IO. I've already solved a few different problems related to installing the root CA as trusted on the client.

Research suggests [this is the root cause](https://stackoverflow.com/a/53112619/470477) of this particular problem.

What do you think?