Support Self-Signed SSL

[djcenox]

If you use self-signed SSL to use rancher throught SSL, you get certification authority error when rancher-cron try to reach metadata.
It should add ca.crt from /var/lib/rancher/etc/ssl/ca.crt same used by rancher agent itself.

[smazurov]

Do you mean this? I would imagine you still need to add cert yourself via a volume.

[djcenox]

Yes, you have to add the CA on that path. I guess the agent would load that path automatically and run update-ca-certs to add ca inside OS boundle. Anyway the cron isn't aware of that. I guess you could add an entrypoint to update certificates before running CMD.

[djcenox]

I think this is the line that add CA.crt to agent here. Running as --privileged can get that crt easily.

[smazurov]

Ok. To summarize, we should pass an env var, that if present, loads those options into the client init.

Then, add to readme instructions on how to create a volume and set that env var in case of self-signed cert.

I don't currently have time to work on this, but PRs are welcome. It should be a relatively straightforward change.