feat: use ld.so.conf.d to add paths

containers/jug/dev.Dockerfile

@@ -314,6 +314,13 @@ EOF
 ## set ROOT TFile forward compatibility
 RUN sed -i 's/# \(TFile.v630forwardCompatibility:\) no/\1 yes/' /usr/local/etc/root/system.rootrc
 
+## Setup ld.so.conf with what could go in LD_LIBRARY_PATH (but lower priority)
+## Ref: https://man7.org/linux/man-pages/man8/ld.so.8.html
+COPY <<EOF /etc/ld.so.conf.d/eic-shell.conf
+/usr/local/lib/root
+EOF
+RUN ldconfig
+
 ## set the local spack configuration
 ENV SPACK_DISABLE_LOCAL_CONFIG="true"
 RUN <<EOF

containers/jug/profile.d/z11_jug_env.sh

 #!/bin/bash
 
-# FIXME: add ROOT libraries to LD_LIBRARY_PATH until removal can be tested 
-export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib/root
-
 if [ ! -z ${EIC_SHELL_PREFIX} ]; then
   if [  "$LD_LIBRARY_PATH" != *"${EIC_SHELL_PREFIX}/lib"* ]; then
     export LD_LIBRARY_PATH=$EIC_SHELL_PREFIX/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}