chore: clang-20 on trixie (non-cuda)

Author: wdconinc

containers/debian/Dockerfile

@@ -92,15 +92,12 @@ mkdir -p /etc/apt/source.list.d
 case ${ID} in
   debian)
     case ${VERSION_CODENAME} in
-      bookworm) GCC="-12" ; CLANG="-18" ;;
-      trixie) GCC="-14" ; CLANG="-19" ;;
+      trixie) GCC="-14" ; CLANG="-20" ;;
       *) echo "Unsupported VERSION_CODENAME=${VERSION_CODENAME}" ; exit 1 ;;
     esac ;;
   ubuntu)
     echo "deb http://ppa.launchpad.net/ubuntu-toolchain-r/ppa/ubuntu/${VERSION_CODENAME} main" > /etc/apt/source.list.d/ubuntu-toolchain.list
     case ${VERSION_CODENAME} in
-      focal) GCC="-10" ; CLANG="-16" ;;
-      jammy) GCC="-12" ; CLANG="-16" ;;
       noble) GCC="-13" ; CLANG="-17" ;;
       *) echo "Unsupported VERSION_CODENAME=${VERSION_CODENAME}" ; exit 1 ;;
     esac ;;

spack-environment/packages.yaml

@@ -242,7 +242,7 @@ packages:
     - '@2.1.0'
   iwyu:
     require:
-    - '@0.23'
+    - '@0.23:'
   jana2:
     require:
     - '@2.4.3'