vaultenv fails with HandshakeFailed error rejecting the certificate by NameMismatch

Hello,

When vaultenv tries to connect to my vault server using TLS it fails with the following message:

``` sh
vaultenv --addr https://127.0.0.1:8200 --token s.11iJ3aza8NC0UL1TWN2koAW3 --secrets-file /tutorial.secrets /script.sh
[ERROR] ServerUnreachable error: HttpExceptionRequest Request {
host = "127.0.0.1"
port = 8200
secure = True
requestHeaders = [("x-vault-token","**removed**")]
path = "/v1/sys/mounts"
queryString = ""
method = "GET"
proxy = Nothing
rawBody = False
redirectCount = 10
responseTimeout = ResponseTimeoutDefault
requestVersion = HTTP/1.1
}
(InternalException (HandshakeFailed (Error_Protocol ("certificate rejected: [NameMismatch \"127.0.0.1\"]",True,CertificateUnknown))))
```

My vault uses a certificate and key that was signed by my private CA. I will attach them here in the hope it helps resolve the issue (don't worry, these certs, keys, token, etc are all temporary, is not the ones in production).

[certificates_and_keys.zip](https://github.com/channable/vaultenv/files/5899174/certificates_and_keys.zip)

Bellow is the output vault gives me in its log (journalctl -u vault.service):
```
Jan 31 04:05:01 tip-off vault[744]: 2021-01-31T04:05:01.213Z [INFO] http: TLS handshake error from 127.0.0.1:46152: remote error: tls: unknown certificate
```

Also, using vault cli works without issue.

Any idea of what this could be?

EDIT:

Looking around to some solution I found this GitHub issue https://github.com/kubernetes-client/haskell/issues/64 which has the same problem.

Looks like that the default implementation of TLS from Haskell doesn't support validating certificates based on IP addresses. There is some workaround discussed there, but since Haskell is very new to me, I'm not sure how to port these workarounds to vaultenv, to be honest.