Allow using proxy to access github etc

[3RDNature]

What problem will this feature address?

Hello

In somecase, GitHub / GitLab can't directly access (e.g., due to firewall restrictions or requiring a VPN for private GitLab instances), necessitating access via an HTTP proxy or Socks proxy.

Describe the solution you'd like

Add an option when creating a “Git provider” that allows users to configure a proxy, enabling dokploy to access these Git providers through the proxy.

Describe alternatives you've considered

• Pass the HTTP_PROXY and HTTPS_PROXY variables into the dokploy container.

• Let CI/CD in gitlab / github, dokploy only pull images.

Additional context

No response

Will you send a PR to implement it?

Maybe, need help