When I'm setting the shacache upload info. I found some issues which maybe need to clarify a bit.

1. When running the command /opt/slapos/bin/generate-signature-key /etc/opt/slapos/slapos.cfg

The command generate-signature-key try to find field name as signature-certificate-file and signature-private-key-file: https://lab.nexedi.com/nexedi/slapos.libnetworkcache/blob/master/slapos/signature.py#L48

But the field names in slapos.cfg are signature_private_key_file and signature_certificate_file: https://lab.nexedi.com/nexedi/slapos.core/blob/master/slapos.cfg.example#L59

I suppose it is just a coding style issue. But we should make it consistent? For now, I just changed my /etc/opt/slapos/slapos.cfg manually and moved forward.

2. The files that Julian gave me are ca.crt and boxiang.crt. But in /etc/opt/slapos/slapos.cfg. It uses *.cert as the extension name. Maybe we should unify it?

/cc @romain @jm