Updated frontend env var injection

docker-stacks/app-server/penpot.yml

@@ -26,7 +26,7 @@ services:
     image: "penpotapp/frontend:${PENPOT_VERSION:-latest}"
     restart: always
     ports:
-      - "8084:80" # Binds your port 8084 layout mapping to Penpot frontend
+      - "8084:80"
     volumes:
       - penpot_assets:/opt/data/assets
     depends_on:
@@ -36,7 +36,10 @@ services:
     networks:
       - penpot-net
     environment:
-      << : [*penpot-flags, *penpot-http-body-size, *penpot-public-uri]
+      # Explicit individual mapping expansions clear the parsing pipeline
+      << : *penpot-flags
+      << : *penpot-http-body-size
+      << : *penpot-public-uri
 
   penpot-backend:
     image: "penpotapp/backend:${PENPOT_VERSION:-latest}"