Need to specify version tag for vrx repository in Dockerfile

[M1chaelM]

During development, we build the latest version of the VRX repository. Once we have a code freeze release for VRX 2023, we need to add the appropriate tag to the clone command in our Dockerfile to make sure the server images always use the same version of the code.

[M1chaelM]

This will need to be updated if we do a 3.2.2 release.

[caguero]

Let's do it when the competition is completed.