Explicitly set a locale to avoid dealing with Lmod behaviour around LC_ALL

Author: ocaisa

.github/workflows/tests_eessi_module.yml

@@ -212,14 +212,17 @@ jobs:
           module unuse .github/workflows/modules
           module avail
 
-          # Store the initial environment (ignoring Lmod tables)
-          env | grep -v _ModuleTable | sort > "${initial_env_file}"
+          # Set a (safe) locale
+          export LC_ALL=C
+
+          # Store the initial environment (ignoring Lmod tables and internal stack varibles)
+          env | grep -v _ModuleTable | grep -v __LMOD_STACK | sort > "${initial_env_file}"
 
           # Do (and undo) loading the EESSI module
           CPU_ARCH=$(./init/eessi_archdetect.sh -a cpupath)
           module load EESSI/${{matrix.EESSI_VERSION}}
           module unload EESSI/${{matrix.EESSI_VERSION}}
-          env | grep -v _ModuleTable | sort > "${module_cycled_file}"
+          env | grep -v _ModuleTable | grep -v __LMOD_STACK |sort > "${module_cycled_file}"
 
           # Now compare the two results (do not expose the files, as they contain the full environment!)
           if (diff "${initial_env_file}" "${module_cycled_file}" > /dev/null); then