!refactor(config): Remove ENV lookup of all CLI flags

So far all CLI flags apart from positionals are loaded from
corresponding environmental values.
This feature is not really used and can be buggy, since fields with the
same name can unintentionally collide between multiple configs.
Thus, remove this feature entirely.

Author: ferdinandjarisch

src/gallia/cli/gallia.py

@@ -33,8 +33,6 @@ def _create_parser_from_command(
     command: type[AsyncScript], config: Config, extra_defaults: defaults, model_counter: int = 0
 ) -> tuple[type[PydanticBaseCommand], defaults, int]:
     config_attributes = command.CONFIG_TYPE.attributes_from_config(config)
-    env_attributes = command.CONFIG_TYPE.attributes_from_env()
-    config_attributes.update(env_attributes)
 
     # it is necessary to create a submodel, because several commands can use the same config
     # (e.g. of their base class if no additional arguments are required)

src/gallia/command/config.py

@@ -445,17 +445,3 @@ def attributes_from_config(cls, config: Config, source: str = "config file") ->
                         result[name] = (f"{source} ({info.config_section}:{name})", value)
 
         return result
-
-    @classmethod
-    def attributes_from_env(cls) -> dict[str, Any]:
-        result = {}
-
-        if (original_infos := cls._original_field_infos) is not None:
-            for name, info in original_infos.items():
-                if isinstance(info, ConfigArgFieldInfo):
-                    config_attribute = f"GALLIA_{name.upper()}"
-
-                    if (value := os.getenv(config_attribute)) is not None:
-                        result[name] = (f"environment variable ({config_attribute})", value)
-
-        return result