feat: add separate optional config for setting up admin

Author: marius-mather

db/admin_config.py

@@ -0,0 +1,17 @@
+from typing import Optional
+
+from pydantic import field_validator
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class AdminSettings(BaseSettings):
+    auth0_custom_domain: Optional[str]
+    admin_client_id: Optional[str]
+    admin_client_secret: Optional[str]
+    model_config = SettingsConfigDict(env_file=".env", extra="ignore")
+
+    @field_validator("auth0_custom_domain", mode="before")
+    def strip_trailing_slash(cls, value: str) -> str:
+        if isinstance(value, str):
+            return value.rstrip("/")
+        return value