Fix Dockerfile: Use npm ci and package-lock for stable builds

frontend/Dockerfile

@@ -1,11 +1,13 @@
 # ========= BASE =========
 FROM node:20-alpine AS base
 WORKDIR /app
+# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
+RUN apk add --no-cache libc6-compat
 
 # ========= DEPENDENCIES =========
 FROM base AS deps
-COPY package.json ./
-RUN npm install
+COPY package*.json ./
+RUN npm ci
 
 # ========= BUILD =========
 FROM base AS builder