Merge branch 'add-arbor-test' into 'test-spacktests-workaround'

add simple installation-time test to arbor

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!294

packages/arbor/package.py

@@ -123,3 +123,8 @@ class Arbor(CMakePackage, CudaPackage):
         args.append("-DARB_CXX_FLAGS_TARGET=" + opt_flags)
 
         return args
+
+    @run_after('install')
+    @on_package_attributes(run_tests=True)
+    def install_test(self):
+        python('-c', 'import arbor')