use node v20 in Dockerfile

web/Dockerfile

@@ -1,6 +1,6 @@
 # Based on https://github.com/vercel/next.js/tree/canary/examples/with-docker
 
-FROM node:18-alpine AS base
+FROM node:20-alpine AS base
 
 # Install dependencies only when needed
 FROM base AS deps
@@ -55,4 +55,4 @@ ENV PORT=3000
 
 # server.js is created by next build from the standalone output
 # https://nextjs.org/docs/pages/api-reference/next-config-js/output
-CMD HOSTNAME="0.0.0.0" node server.js
+CMD HOSTNAME="0.0.0.0" node server.js