[valkey] Probes not working with tls.requireClientCertificate

[vlaborie]

Probes are not working when tls.requireClientCertificate: true is set because of missing client certificate and key:

1:M 22 Jul 2026 11:44:53.227 # Error accepting a client connection: error:0A0000C7:SSL routines::peer did not return a certificate (addr=127.0.0.1:44282 laddr=127.0.0.1:6379)

Probes must set --cert and --key params to valkey-cli.