docker: remove duplication of NODE_ENV

Dockerfile

@@ -1,7 +1,5 @@
 FROM node:22-alpine
 
-ARG NODE_ENV=production
-ENV NODE_ENV=$NODE_ENV
 ENV PATH=/app/node_modules/.bin:$PATH
 
 WORKDIR /app

docker-compose.yml

@@ -9,10 +9,10 @@ services:
     env_file:
       - .env
     environment:
+      - NODE_ENV=production
       - HOST=0.0.0.0
       - PORT=1337
       - DATABASE_CLIENT=sqlite
       - DATABASE_FILENAME=data/base/sqlite.db
-      - NODE_ENV=production
       - STRAPI_TELEMETRY_DISABLED=true
     restart: unless-stopped