Module step uses initial environment so must tweak that

Author: ocaisa

eb_hooks.py

@@ -450,7 +450,8 @@ def pre_module_hook_zen4_gcccore1220(self, *args, **kwargs):
                              tcversion=self.toolchain.version):
         if hasattr(self, EESSI_MODULE_ONLY_ATTR):
             # Allow the module to be loaded in the module step
-            os.environ[EESSI_IGNORE_ZEN4_GCC1220_ENVVAR] = "1"
+            print_msg(f"Setting {EESSI_IGNORE_ZEN4_GCC1220_ENVVAR} in initial environment")
+            self.initial_environ[EESSI_IGNORE_ZEN4_GCC1220_ENVVAR] = "1"
 
 
 def post_module_hook_zen4_gcccore1220(self, *args, **kwargs):
@@ -472,8 +473,9 @@ def post_module_hook_zen4_gcccore1220(self, *args, **kwargs):
                                  EESSI_FORCE_ATTR)
 
         # If the variable to allow loading is set, remove it
-        if os.environ.get(EESSI_IGNORE_ZEN4_GCC1220_ENVVAR, False):
-            del os.environ[EESSI_IGNORE_ZEN4_GCC1220_ENVVAR]
+        if self.initial_environ.get(EESSI_IGNORE_ZEN4_GCC1220_ENVVAR, False):
+            print_msg(f"Removing {EESSI_IGNORE_ZEN4_GCC1220_ENVVAR} in initial environment")
+            del self.initial_environ[EESSI_IGNORE_ZEN4_GCC1220_ENVVAR]
 
 
 # Modules for dependencies are loaded in the prepare step. Thus, that's where we need this variable to be set