Dockerfile

# Use the official Node.js 20 image as the base image
FROM node:20-alpine AS builder

# Set the working directory
WORKDIR /app

# Copy package.json and package-lock.json
COPY package.json package-lock.json ./

# Install dependencies
RUN npm ci

# Copy the rest of the application code
COPY . .

# Build the Next.js application
RUN npm run build

# Use a smaller base image for the final stage
FROM node:20-alpine AS runner

# Set the working directory
WORKDIR /app

# Copy package.json and package-lock.json first to leverage Docker cache
COPY --from=builder /app/package.json ./
COPY --from=builder /app/package-lock.json ./

# Install only production dependencies
RUN npm ci --only=production

# Copy the built application from the builder stage
COPY --from=builder /app/.next ./.next
COPY --from=builder /app/public ./public

# Copy the .env file last to avoid invalidating the cache for previous layers
COPY --from=builder /app/.env ./

# Expose the port the app runs on
EXPOSE 3000

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