Check that environment exists when setting in config (#2578)

* Check that environment exists when setting in config

* Sort keys when exporting config to a dict

modal/cli/config.py

@@ -3,6 +3,7 @@
 from rich.console import Console
 
 from modal.config import _profile, _store_user_config, config
+from modal.environments import Environment
 
 config_cli = typer.Typer(
     name="config",
@@ -38,6 +39,8 @@ def show(redact: bool = typer.Option(True, help="Redact the `token_secret` value
 
 @config_cli.command(help=SET_DEFAULT_ENV_HELP)
 def set_environment(environment_name: str):
+    # Confirm that the environment exists by looking it up
+    Environment.lookup(environment_name)
     _store_user_config({"environment": environment_name})
     typer.echo(f"New default environment for profile {_profile}: {environment_name}")
 

modal/config.py

@@ -268,7 +268,7 @@ def __repr__(self):
         return repr(self.to_dict())
 
     def to_dict(self):
-        return {key: self.get(key) for key in _SETTINGS.keys()}
+        return {key: self.get(key) for key in sorted(_SETTINGS)}
 
 
 config = Config()