feat: geant4 with eAST physics list

eic-spack.sh

@@ -3,7 +3,7 @@ EICSPACK_ORGREPO="eic/eic-spack"
 
 ## EIC spack github version, e.g. v0.19.7 or commit hash
 ## note: nightly builds will use e.g. releases/v0.19
-EICSPACK_VERSION="v0.20.11"
+EICSPACK_VERSION="v0.20.12"
 
 ## Space-separated list of eic-spack cherry-picks
 read -r -d '' EICSPACK_CHERRYPICKS <<- \

spack-environment/packages.yaml

@@ -113,7 +113,7 @@ packages:
     - -debuginfod
   geant4:
     require:
-    - '@11.1.1'
+    - '@11.1.1.east'
     - cxxstd=17 -vecgeom +threads -vtk
     - any_of: [+opengl +qt +x11, -opengl -qt -x11]
   graphviz: