fix(docker): use Alpine and reduce memory for build

- Switch from node:20-slim to node:20-alpine for smaller image

- Reduce NODE_OPTIONS memory from 4096 to 2048

- Use Alpine apk instead of apt-get

Dockerfile

@@ -1,24 +1,32 @@
-FROM node:20-slim AS builder
+# Multi-stage build with memory optimization
+FROM node:20-alpine AS builder
 WORKDIR /app
 
+# Skip browser downloads
 ENV PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD=1
 ENV CYPRESS_INSTALL_BINARY=0
 
-RUN apt-get update && apt-get install -y \
-    python3 \
-    make \
-    g++ \
-    && rm -rf /var/lib/apt/lists/*
+# Install build dependencies
+RUN apk add --no-cache python3 make g++
 
+# Copy package files
 COPY package*.json ./
-RUN npm install --legacy-peer-deps
 
+# Install dependencies with reduced memory
+RUN npm install --legacy-peer-deps --prefer-offline --no-audit
+
+# Copy source
 COPY . .
-RUN NODE_OPTIONS="--max-old-space-size=4096" npm run build
 
+# Build with memory optimization (reduced from 4096 to 2048 for Alpine)
+ENV NODE_OPTIONS="--max-old-space-size=2048"
+RUN npm run build
+
+# Runtime stage
 FROM node:20-alpine
 WORKDIR /app
 
+# Copy built output
 COPY --from=builder /app/.output ./.output
 
 ENV PORT=9202