Make session cookie age and oidc token renew timeouts configurable

Author: swrichards

src/open_inwoner/conf/base.py

@@ -512,7 +512,10 @@
     "ADMIN_SESSION_COOKIE_AGE", 3600
 )  # Default 1 hour max session duration for admins
 SESSION_WARN_DELTA = 120  # Warn 2 minutes before end of session.
-SESSION_COOKIE_AGE = 900  # Set to 15 minutes or less for testing
+# Set to 15 minutes or less for testing
+SESSION_COOKIE_AGE = config("SESSION_COOKIE_AGE", 900)
+OIDC_RENEW_ID_TOKEN_EXPIRY_SECONDS = config("OIDC_RENEW_ID_TOKEN_EXPIRY_SECONDS", 901)
+
 
 LOGIN_REDIRECT_URL = "/"
 LOGOUT_REDIRECT_URL = "/accounts/login/"