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Dockerfile

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+# ==================== BUILD STAGE ====================
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+# Install chromium dependencies for whatsapp-web.js
+RUN apk add --no-cache \
+    chromium \
+    nss \
+    freetype \
+    harfbuzz \
+    ca-certificates \
+    ttf-freefont \
+    git
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci --production=false
+
+# Copy patches directory if it exists
+COPY patches ./patches
+
+# Run postinstall (patch-package)
+RUN npm run postinstall || true
+
+# Copy application files
+COPY server.js ./
+
+# ==================== RUNTIME STAGE ====================
+FROM node:20-alpine
+WORKDIR /app
+
+# Install chromium and runtime dependencies
+RUN apk add --no-cache \
+    chromium \
+    nss \
+    freetype \
+    harfbuzz \
+    ca-certificates \
+    ttf-freefont
+
+# Tell Puppeteer to use installed chromium
+ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true \
+    PUPPETEER_EXECUTABLE_PATH=/usr/bin/chromium-browser
+
+# Create non-root user
+RUN addgroup -g 1000 whatsapp && \
+    adduser -D -u 1000 -G whatsapp whatsapp
+
+# Copy dependencies from builder
+COPY --from=builder --chown=whatsapp:whatsapp /app/node_modules ./node_modules
+
+# Copy application files
+COPY --chown=whatsapp:whatsapp server.js ./
+COPY --chown=whatsapp:whatsapp package*.json ./
+
+# Create volume directories
+RUN mkdir -p /app/data /app/media /app/.wwebjs_cache /app/.wwebjs_auth && \
+    chown -R whatsapp:whatsapp /app
+
+USER whatsapp
+
+EXPOSE 3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
+    CMD node -e "require('http').get('http://localhost:3000/health', (r) => { process.exit(r.statusCode === 200 ? 0 : 1); }).on('error', () => process.exit(1));"
+
+CMD ["node", "server.js"]