Base oneapi_jug_xl off jug_xl

Use baseargs in Dockerfiles to base oneapi_jug_xl off jug_xl

containers/jug/xl.Dockerfile

 #syntax=docker/dockerfile:1.2
 ARG DOCKER_REGISTRY="eicweb.phy.anl.gov:4567/containers/eic_container/"
-ARG INTERNAL_TAG="testing" 
+ARG INTERNAL_TAG="testing"
+ARG BASEIMAGE="jug_dev"
 
 ## ========================================================================================
 ## STAGE1: spack builder image
 ## EIC builder image with spack
 ## ========================================================================================
-FROM ${DOCKER_REGISTRY}jug_dev:${INTERNAL_TAG}
+FROM ${DOCKER_REGISTRY}${BASEIMAGE}:${INTERNAL_TAG}
 
 ARG EICWEB="https://eicweb.phy.anl.gov/api/v4/projects"
 ARG JUGGLER_VERSION="master"