Try something else to save space

frontend/Dockerfile

@@ -1,15 +1,25 @@
+# ---------- deps ----------
+FROM docker.io/node:20-alpine AS deps
+WORKDIR /app
+
+# Install only dependencies first
+COPY package*.json ./
+RUN npm install --production --no-audit --no-fund
+
 # ---------- build ----------
 FROM docker.io/node:20-alpine AS builder
 WORKDIR /app
 
-# Clean any existing cache before starting
-RUN npm cache clean --force
+# Copy production dependencies from deps stage
+COPY --from=deps /app/node_modules ./node_modules
 
-# install deps (needs dev deps for build)
+# Copy package files
 COPY package*.json ./
-RUN npm cache clean --force && npm install --prefer-offline --no-audit --no-fund && npm cache clean --force
 
-# app source
+# Install dev dependencies
+RUN npm install --only=dev --no-audit --no-fund
+
+# Copy app source
 COPY . .
 
 # disable telemetry; let Next control NODE_ENV during build