clan_cli: create key directory

pkgs/clan-cli/clan_cli/secrets/key.py

@@ -10,6 +10,8 @@ def generate_key() -> str:
     if path.exists():
         raise ClanError(f"Key already exists at {path}")
     priv_key, pub_key = generate_private_key()
+    if not (parent := path.parent).exists():
+        parent.mkdir(parents=True, exist_ok=True)
     path.write_text(priv_key)
     return pub_key