ADD: first aarch64 system config & envs

env/sles15/aarch64/admin/stable/spack.yaml

@@ -0,0 +1,25 @@
+---
+spack:
+  concretizer:
+    unify: false
+  config:
+    install_tree:
+      root: $spack/opt/spack/stable
+  definitions:
+  - gcc_12.3_mpich:
+    - relion@4.0.1/ve5sish     #+cuda
+  include:
+    - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
+    - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
+  mirrors:
+    local_psi: file:///afs/psi.ch/software/spack/testing
+  modules:
+    default:
+      roots:
+        tcl: $spack/opt/spack/stable/modulefiles
+  specs:
+  - matrix:
+    - [$gcc_12.3_mpich]
+    - ['%gcc@12.3']
+    - [^cray-mpich]
+  view: false