Moved CONFIG import so it does not get triggered when just importing …

…BaseResourceMapper

optimade/server/mappers/entries.py

@@ -1,5 +1,4 @@
 from typing import Tuple, Optional
-from optimade.server.config import CONFIG
 
 __all__ = ("BaseResourceMapper",)
 
@@ -45,6 +44,8 @@ def all_aliases(cls) -> Tuple[Tuple[str, str]]:
             A tuple of alias tuples.
 
         """
+        from optimade.server.config import CONFIG
+
         return (
             tuple(
                 (f"_{CONFIG.provider.prefix}_{field}", field)
@@ -67,6 +68,8 @@ def all_length_aliases(cls) -> Tuple[Tuple[str, str]]:
             A tuple of length alias tuples.
 
         """
+        from optimade.server.config import CONFIG
+
         return cls.LENGTH_ALIASES + tuple(
             CONFIG.length_aliases.get(cls.ENDPOINT, {}).items()
         )