Dockerfile

# Use Node.js 18 LTS as base image
FROM node:18-alpine AS base

# Install dependencies only when needed
FROM base AS deps
RUN apk add --no-cache libc6-compat
WORKDIR /app

# Copy package files
COPY package*.json ./
RUN npm ci --only=production

# Rebuild the source code only when needed
FROM base AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci

# Copy source code
COPY . .

# Build the application
RUN npm run build

# Production image, copy all the files and run the app
FROM base AS runner
WORKDIR /app

# Create a non-root user
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 adoptabot

# Copy the built application
COPY --from=builder /app/dist ./dist
COPY --from=deps /app/node_modules ./node_modules
COPY --from=builder /app/package*.json ./

# Copy migration files if they exist
COPY --from=builder /app/migrations ./migrations

# Set ownership
RUN chown -R adoptabot:nodejs /app
USER adoptabot

# Expose the port the app runs on
EXPOSE 3000

# Set environment variables
ENV NODE_ENV=production
ENV PORT=3000

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

# Start the application
CMD ["npm", "run", "start"]