Dockerfile

# use Node.js 20 slim image
FROM node:20-slim

# install system dependencies and Chrome in one layer
RUN apt-get update && apt-get install -y \
    wget \
    gnupg \
    ca-certificates \
    fonts-liberation \
    libappindicator3-1 \
    libasound2 \
    libatk-bridge2.0-0 \
    libatk1.0-0 \
    libatspi2.0-0 \
    libdrm2 \
    libgtk-3-0 \
    libnspr4 \
    libnss3 \
    libxcomposite1 \
    libxdamage1 \
    libxfixes3 \
    libxrandr2 \
    libxss1 \
    libxtst6 \
    xdg-utils \
    --no-install-recommends \
    && wget -q -O - https://dl.google.com/linux/linux_signing_key.pub | apt-key add - \
    && echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" > /etc/apt/sources.list.d/google-chrome.list \
    && apt-get update \
    && apt-get install -y google-chrome-stable \
    && rm -rf /var/lib/apt/lists/*

# set working directory
WORKDIR /app

# set Puppeteer environment variables
ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true
ENV PUPPETEER_EXECUTABLE_PATH=/usr/bin/google-chrome-stable

# copy package files first for better layer caching
COPY server/package.json server/package-lock.json ./server/

# install dependencies with optimizations for reliability
RUN cd server && npm ci --only=production --no-audit --prefer-offline

# copy application files
COPY . .

# expose port
EXPOSE 5000

# start application
CMD ["node", "server/server.js"]