Backported patches to DD4hep master

Incorporate critical patches to DD4hep (back ported from master):

• https://github.com/AIDASoft/DD4hep/pull/849
• https://github.com/AIDASoft/DD4hep/pull/851

containers/jug/dev.Dockerfile

@@ -94,6 +94,13 @@ RUN --mount=type=cache,target=/var/cache/spack-mirror                   \
  && spack install -j64 --no-check-signature                             \
  && spack clean -a                                                  
 
+## Optional, normally commented out:
+## Nuke the buildcache
+## This is useful when going to completely different containers,
+## or intermittently to keep the buildcache step from taking too much time
+RUN --mount=type=cache,target=/var/cache/spack-mirror                   \
+  rm -rf /var/cache/spack-mirror/*
+
 ## Update the local build cache if needed. Consists of 3 steps:
 ## 1. Remove the B010 network buildcache (silicon)
 ## 2. Get a list of all packages, and compare with what is already on