fix: load env_file in init-rp for staging compose

docker/staging_pull_compose.template.yaml

@@ -264,6 +264,8 @@ services:
 
   init-rp:
     image: oryd/hydra:${HYDRA_VERSION:-v25.4.0}
+    env_file:
+      - .env
     entrypoint: ["/bin/sh"]
     command:
       - -ec