Add py-torch to container

Add py-torch to container so that libtorch binaries are accessible for running inference

spack-environment/packages.yaml

@@ -300,6 +300,9 @@ packages:
   py-toml:
     require:
     - '@0.10.2'
+  py-torch:
+    require:
+    - '@2.0.0'  
   py-uproot:
     require:
     - '@5.0.5'