fix(actions): use SSH_DOMAIN for server URL when app domain is different #35700
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When SSH_DOMAIN is configured to use a different hostname than the main AppURL domain, Gitea Actions should provide the SSH domain in the server_url context to ensure checkout actions connect to the correct SSH hostname.
This fixes an issue where workflows would fail with 'Host key verification failed' because checkout actions were trying to connect to the wrong SSH hostname when SSH_DOMAIN was configured differently from the main domain.
Fixes: Actions workflows failing when SSH_DOMAIN != main domain
Before: server_url always used AppURL domain (e.g., git.example.com)
After: server_url uses SSH_DOMAIN when different (e.g., git-ssh.example.com)