Add config flow to local_file (#34723)

source/_integrations/local_file.markdown

@@ -6,6 +6,7 @@ ha_category:
 ha_iot_class: Local Polling
 ha_release: 0.22
 ha_domain: local_file
+ha_config_flow: true
 ha_platforms:
   - camera
 ha_integration_type: integration
@@ -18,28 +19,11 @@ The **Local file** camera {% term integration %} allows you to integrate an imag
 
 The `local_file` camera can for example be used with various camera platforms that save a temporary images locally. It can also be used to display a graph that you render periodically and will then be displayed in Home Assistant.
 
-## Configuration
+{% note %}
+The file path must be added to [allowlist_external_dirs](/integrations/homeassistant/#allowlist_external_dirs) for the integration to be able to read it.
+{% endnote %}
 
-To enable this camera in your installation, add the following to your {% term "`configuration.yaml`" %} file.
-{% include integrations/restart_ha_after_config_inclusion.md %}
-
-```yaml
-# Example configuration.yaml entry
-camera:
-  - platform: local_file
-    file_path: /tmp/image.jpg
-```
-
-{% configuration %}
-file_path:
-  description: "File to serve as the camera. Use a full path, e.g., `/config/www/images/image.jpg `."
-  required: true
-  type: string
-name:
-  description: Name of the camera.
-  required: false
-  type: string
-{% endconfiguration %}
+{% include integrations/config_flow.md %}
 
 ### Action `local_file.update_file_path`