Fix URL schemes in dokku urls output

Previously, the presence of TLS certificates would cause `dokku urls` to
output all https URLs, even for domains which were not configured to use
TLS.

This change introduces a URLS file in the app's directory which contains
the URLs with schemes based on whether they have been configured to use
TLS in the nginx config.

Signed-off-by: Lewis Marshall <lewis@lmars.net>

plugins/nginx-vhosts/commands

@@ -18,6 +18,7 @@ case "$1" in
   nginx:build-config)
     APP="$2"; DOKKU_APP_LISTEN_PORT="$3"; DOKKU_APP_LISTEN_IP="${4}"
     VHOST_PATH="$DOKKU_ROOT/$APP/VHOST"
+    URLS_PATH="$DOKKU_ROOT/$APP/URLS"
     WILDCARD_SSL="$DOKKU_ROOT/tls"
     SSL="$DOKKU_ROOT/$APP/tls"
 
@@ -94,6 +95,10 @@ EOF
         echo "       Reloading nginx"
         restart_nginx
       fi
+
+      echo "# THIS FILE IS GENERATED BY DOKKU - DO NOT EDIT, YOUR CHANGES WILL BE OVERWRITTEN" > $URLS_PATH
+      xargs -i echo "https://{}" <<< "${SSL_VHOSTS}" >> $URLS_PATH
+      xargs -i echo "http://{}" <<< "${NONSSL_VHOSTS}" >> $URLS_PATH
     else
       if [[ -f "$DOKKU_ROOT/$APP/VHOST" ]]; then
         dokku_log_info1 "VHOST support disabled, deleting $APP/VHOST"