Review the "Including the plug-in binaries in the registry image" https://access.redhat.com/documentation/en-us/red_hat_codeready_workspaces/2.0/html-single/administration_guide/index#including-the-plug-in-binaries-in-the-registry-image_customizing-the-devfile-and-plug-in-registries documentation.

search for FIXME in the documentation. Change FIXME to what it should be.