chore: make app port configurable via PORT env var

Dockerfile

@@ -34,9 +34,7 @@ COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
 COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
 
 USER nextjs
-EXPOSE 3000
-ENV PORT=3000
-ENV HOSTNAME=0.0.0.0
+EXPOSE ${PORT:-3000}
 
 CMD ["node", "server.js"]
 

docker-compose.prod.yml

@@ -93,13 +93,15 @@ services:
       AWS_ACCESS_KEY_ID: ${AWS_ACCESS_KEY_ID:-}
       AWS_SECRET_ACCESS_KEY: ${AWS_SECRET_ACCESS_KEY:-}
       AWS_REGION: ${AWS_REGION:-}
+      PORT: ${PORT:-3000}
+      HOSTNAME: "0.0.0.0"
     labels:
       - "traefik.enable=true"
       - "traefik.http.routers.curio.rule=Host(`${DOMAIN}`)"
       - "traefik.http.routers.curio.entrypoints=websecure"
       - "traefik.http.routers.curio.tls=true"
       - "traefik.http.routers.curio.tls.certresolver=letsencrypt"
-      - "traefik.http.services.curio.loadbalancer.server.port=3000"
+      - "traefik.http.services.curio.loadbalancer.server.port=${PORT:-3000}"
 
   worker:
     build: