Add numerical library PETSc with ROCm support

environments/numlibs/spack.yaml

@@ -12,7 +12,7 @@ spack:
     - $spack/../environments/hlrs
   packages:
     all:
-      prefer: ['%gcc@7.5']
+      prefer: ['%gcc@13.2'] # , '+rocm amdgpu_target=gfx942']
   # add package specs to the `specs` list
   specs:
     - matrix:
@@ -50,6 +50,13 @@ spack:
 #      - [$num_lib_types]
 #      - [$^mpis]
 #      - [$%compilers]
+    - matrix:
+      - [petsc]
+      - [$rocm_variant]
+      - [$num_integer_types]
+      - [$num_lib_types]
+      - [$^mpis]
+      - [$%compilers]      
   view: false
   concretizer:
     unify: when_possible