The only supported workaround is configuring what is listening on the ports 80 and 443 to pass requests to a subfolder of the main domain to the Discourse container. That is documented at Subfolder support with Docker.
The only supported workaround is configuring what is listening on the ports 80 and 443 to pass requests to a subfolder of the main domain to the Discourse container. That is documented at Subfolder support with Docker.