refactor: simplify how url generation works

The URLS file is no longer necessary as urls are now generated directly from the app VHOST file.

This also moves all the url generation logic to the domains plugin.

plugins/nginx-vhosts/functions

@@ -311,7 +311,6 @@ nginx_build_config() {
   declare desc="build nginx config to proxy app containers using sigil"
   declare APP="$1" DOKKU_APP_LISTEN_PORT="$2" DOKKU_APP_LISTEN_IP="$3"
   local VHOST_PATH="$DOKKU_ROOT/$APP/VHOST"
-  local APP_URLS_PATH="$DOKKU_ROOT/$APP/URLS"
   local NGINX_TEMPLATE_NAME="nginx.conf.sigil"
   local NGINX_TEMPLATE="$PLUGIN_AVAILABLE_PATH/nginx-vhosts/templates/$NGINX_TEMPLATE_NAME"
   local SCHEME=http
@@ -329,7 +328,7 @@ nginx_build_config() {
   plugn trigger domains-vhost-enabled "$APP" 2>/dev/null || IS_APP_VHOST_ENABLED=false
 
   local IS_SSL_ENABLED=false
-  if is_ssl_enabled "$APP"; then
+  if [[ "$(plugn trigger certs-exists "$APP")" == "true" ]]; then
     IS_SSL_ENABLED=true
   fi
 
@@ -516,11 +515,6 @@ nginx_build_config() {
       dokku_log_verbose "Reloading nginx"
       validate_nginx && restart_nginx >/dev/null
     fi
-
-    if ([[ -n "$NONSSL_VHOSTS" ]] || [[ -n "$SSL_VHOSTS" ]]) && [[ "$IS_APP_VHOST_ENABLED" == "true" ]]; then
-      echo "# THIS FILE IS GENERATED BY DOKKU - DO NOT EDIT, YOUR CHANGES WILL BE OVERWRITTEN" >"$APP_URLS_PATH"
-      xargs -i echo "$SCHEME://{}" <<<"$(echo "${SSL_VHOSTS}" "${NONSSL_VHOSTS}" | tr ' ' '\n' | sort -u)" >>"$APP_URLS_PATH"
-    fi
   else
     # note because this clause is long. if the proxy is disabled:
     dokku_log_info1 "Nginx support is disabled for app ($APP)"