Fix package_sets condition in install_environment function

spack-environments @ 4429e664

+Subproject commit 4429e6640f2d1460dd5ea88c517dea484825afd0

src/mpsd_software_manager/cmds/install.py

@@ -64,9 +64,10 @@ def install_environment(
     # run the prepare_environment function
     available_package_sets = prepare_environment(mpsd_release, root_dir)
     # Ensure that the requested package_sets are available in the release
-    if package_sets == "ALL":
+    if package_sets == ["ALL"]:
         package_sets = available_package_sets
     elif package_sets == "NONE":
+        # TODO: This if case is never reached, because of new argparse logic. Remove it.
         # No package_sets requested, so we only create the env and print the
         # list of available package_sets
         logging.warning(