app: lower the suffixes

Lower the suffixes to also match
the filenames with uppercase suffixes

server/app/main.py

@@ -29,13 +29,13 @@
  continue
  print(f"Loading {file}")
 
- if file.suffix == ".json":
+ if file.suffix.lower() == ".json":
  with open(file) as f:
  adapter.json.read_aas_json_file_into(object_store, f)
- elif file.suffix == ".xml":
+ elif file.suffix.lower() == ".xml":
  with open(file) as f:
  adapter.xml.read_aas_xml_file_into(object_store, file)
- elif file.suffix == ".aasx":
+ elif file.suffix.lower() == ".aasx":
  with aasx.AASXReader(file) as reader:
  reader.read_into(object_store=object_store, file_store=file_store)
 
@@ -44,3 +44,6 @@
 else:
  print(f"STORAGE_TYPE must be either LOCAL_FILE or LOCAL_FILE_READ_ONLY! Current value: {storage_type}",
  file=sys.stderr)
+
+# Lower the suffix
+# Lower the suffixes to also match the filenames with uppercase suffixes