🔖 chore(spec.py): add publish_apidoc flag to SpecTree constructor

The `publish_apidoc` flag is added to the `SpecTree` constructor to allow users to disable publishing of the API documentation. If the flag is set to `False`, the `register_route` method will not be called, and the `backend.app` attribute will be set to the `app` attribute.

spectree/spec.py

@@ -67,6 +67,7 @@ def __init__(
         validation_error_model: Optional[ModelType] = None,
         naming_strategy: NamingStrategy = get_model_key,
         nested_naming_strategy: NestedNamingStrategy = get_nested_key,
+        publish_apidoc: bool = True,
         **kwargs: Any,
     ):
         self.naming_strategy = naming_strategy
@@ -77,6 +78,7 @@ def __init__(
         self.validation_error_model = validation_error_model or ValidationError
         self.config: Configuration = Configuration.parse_obj(kwargs)
         self.backend_name = backend_name
+        self.publish_apidoc = publish_apidoc
         if backend:
             self.backend = backend(self)
         else:
@@ -95,7 +97,10 @@ def register(self, app: Any):
         init step.
         """
         self.app = app
-        self.backend.register_route(self.app)
+        if self.publish_apidoc:
+            self.backend.register_route(self.app)
+        else:
+            self.backend.app = self.app
 
     @property
     def spec(self):