r/gitea: Update to 1.17.0

The only major change that affects the configuration policy is the
introduction of the `webhook.ALLOWED_HOST_LIST` setting.  For some dumb
reason, the default value of this setting *denies* access to machines on
the local network.  This makes no sense; why do they expect you to host
your CI or whatever on a *public* network?  Of course, the only reason
given is "for security reasons."

roles/gitea/templates/app.ini.j2

@@ -67,3 +67,6 @@ JWT_SECRET = {{ gitea_oauth2_jwt_secret }}
 
 [metrics]
 ENABLED = true
+
+[webhook]
+ALLOWED_HOST_LIST = {{ gitea_webhook_allowed_host_list|join(',') }}