web_framework: Disable caching templates files in development mode

- When a template page is updated, we are having to restart service in order for
the new changes to reflect. This is due to caching of template files starting
Django 4.1[1]. Disable this behavior in development mode to allow reload the
browser page to see changes reflected.

Links:

https://docs.djangoproject.com/en/5.0/releases/4.1/#templates

Tests:

- Change a template file and reload the page without restarting service. The
changes should reflect immediately.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Veiko Aasa <veiko17@disroot.org>

plinth/web_framework.py

@@ -45,6 +45,14 @@ def init():
     settings.STATIC_URL = '/'.join([cfg.server_dir,
                                     'static/']).replace('//', '/')
     settings.USE_X_FORWARDED_HOST = cfg.use_x_forwarded_host
+    if cfg.develop:
+        # Disable template caching in development so that page updates don't
+        # require service restart.
+        del settings.TEMPLATES[0]['APP_DIRS']
+        settings.TEMPLATES[0]['OPTIONS']['loaders'] = [
+            'django.template.loaders.filesystem.Loader',
+            'django.template.loaders.app_directories.Loader',
+        ]
 
     kwargs = {}
     for setting in dir(settings):