adding logging for ldap exceptions

app/services/ldap.py

@@ -6,6 +6,8 @@ blocking the event loop. Login builds the user's DN from
 successful profile is provisioned locally on first sign-in.
 """
 
+import logging
+
 from dataclasses import dataclass
 
 from fastapi.concurrency import run_in_threadpool
@@ -40,10 +42,9 @@ def _bind_and_fetch(username: str, password: str) -> LdapIdentity | None:
         get_info=ldap3.NONE,
     )
     try:
-        conn = ldap3.Connection(
-            server, user=user_dn, password=password, auto_bind=True
-        )
-    except LDAPException:
+        conn = ldap3.Connection(server, user=user_dn, password=password, auto_bind=True)
+    except LDAPException as e:
+        logging.exception("Failed to log into LDAP for user %s", user_dn)
         # Wrong credentials, unreachable server, or a refused bind.
         return None