misc: add authentic2 plugin class (#62849)

setup.py

@@ -59,6 +59,11 @@ setup(
     install_requires=[
         'authentic2',
     ],
+    entry_points={
+        'authentic2.plugin': [
+            'authentic2-gnm = authentic2_gnm:Plugin',
+        ],
+    },
     cmdclass={'sdist': eo_sdist},
     zip_safe=False,
 )

src/authentic2_gnm/__init__.py

@@ -38,3 +38,20 @@ class AppConfig(django.apps.AppConfig):
 
 
 default_app_config = 'authentic2_gnm.AppConfig'
+
+
+class Plugin:
+    def get_before_urls(self):
+        return []
+
+    def get_apps(self):
+        return [__name__]
+
+    def get_authentication_backends(self):
+        return []
+
+    def get_auth_frontends(self):
+        return []
+
+    def get_after_middleware(self):
+        return []