Configurable BASE_URL setting

The BASE_URL setting is so far used when sending notifications, you can use it to customise the notification body using the {base_url} token.

The BASE_URL is set initially in your environment vars

export BASE_URL=https://mysite.com:5000

or from your docker-compose.yml recipe.

The BASE_URL setting can also be overridden in the Settings page.

NOTE: The BASE_URL setting has nothing todo with setting the correct domain/path base links in the changedetection.io installation, this should be handled via a reverse proxy, please see https://github.com/dgtlmoon/changedetection.io/wiki/Running-changedetection.io-behind-a-reverse-proxy

However if BASE_URL is not set, the RSS will use the default webservers path to build the RSS index of links

Don't forget to include the :port number