virgl_test_server: Option to specify socket

I want to kindly ask if it is possible to add an option to virgl_test_server that allows to specify a socket different from default /tmp/.virgl_test.

My desire is to run Docker containers with virgl. Therefore I have to share the socket. I'd like to run one instance of virgl_test_server for each container with its own socket. So I can start and stop virgl_test_server along with starting and stopping a container without having to check if another container uses the same socket.

I have tried to set TMPDIR to a different location, but that did not help.