roles/gitea: Allow configuring clone URLs

The `gitea_ssh_domain` and `gitea_http_domain` variables can be used to
configure the host portion of the URLs for cloning Git repositories over
SSH and HTTPS, respectively. By default, both values are the FQDN of the
machine hosting Gitea.

roles/gitea/templates/app.ini.j2

@@ -21,10 +21,10 @@ ROOT = /var/lib/gitea/gitea-repositories
 
 [server]
 APP_DATA_PATH    = /var/lib/gitea
-SSH_DOMAIN       = localhost
-DOMAIN           = localhost
+SSH_DOMAIN       = {{ gitea_ssh_domain }}
+DOMAIN           = {{ gitea_http_domain }}
 HTTP_PORT        = 3000
-ROOT_URL         = http://localhost:3000/
+ROOT_URL         = {{ gitea_root_url }}
 DISABLE_SSH      = false
 SSH_PORT         = 22
 LFS_START_SERVER = true