AuthN: Make clientTokenRotation work when Grafana is accessible on a sub url (#69385)

Fix clientTokenRotation for auth-proxy

devenv/docker/blocks/auth/nginx_proxy_mac/docker-compose.yaml

@@ -1,11 +1,13 @@
-# This will proxy all requests for http://localhost:10080/grafana/ to
+# This will proxy all requests for http://localhost:8090/grafana/ to
 # http://localhost:3000 (Grafana running locally)
 #
 # Please note that you'll need to change the root_url in the Grafana configuration:
-# root_url = %(protocol)s://%(domain)s:10080/grafana/
+# root_url = %(protocol)s://%(domain)s:8090/grafana/
 
   nginxproxy:
     build: docker/blocks/auth/nginx_proxy_mac
+    volumes:
+      - "./docker/blocks/auth/nginx_proxy_mac/nginx_login_only.conf:/etc/nginx/nginx.conf"
     ports:
-      - "10080:10080"
+      - "8090:8090"