📄 Dockerfile
# Multi-stage build for Stop It! game

# Stage 1: Build stage
FROM node:20-alpine AS builder

WORKDIR /app

# Copy package files
COPY package*.json ./

# Install ALL dependencies (including devDependencies for build)
RUN npm ci

# Copy source code
COPY . .

# Build the SvelteKit application
RUN npm run build

# Prune dev dependencies
RUN npm prune --production

# Stage 2: Production stage
FROM node:20-alpine AS runtime

WORKDIR /app

# Copy package files
COPY package*.json ./

# Copy production dependencies from builder
COPY --from=builder /app/node_modules ./node_modules

# Copy built application
COPY --from=builder /app/build ./build

# Copy server code
COPY --from=builder /app/server ./server

# Expose port 3000
EXPOSE 3000

# Set NODE_ENV to production
ENV NODE_ENV=production

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD node -e "require('http').get('http://localhost:3000', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"

# Start the unified server
CMD ["node", "server/index.js"]