Harbor: Enhance harbor configurations

[pgbezerra]

Create a checkbox to select if a external load balance will be used.
If marked as true, the following configuration should be suppressed:

# When setting up Harbor behind other proxy, such as an Nginx instance, remove the below line if the proxy already has similar settings.
proxy_set_header X-Forwarded-Proto $scheme;

Receive a public and private keys to configure registry and UI correctly.

Changing those configurations will be easy to secure the system with external load balance with HTTPS. I did on my server, but manually editing the files.

After finish I realized that will not be so hard to do this by catalog.