Dockerfile

# Stage 1: Dependencies
FROM node:18-alpine AS deps
WORKDIR /app

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

# Install dependencies
RUN yarn install --frozen-lockfile

# Stage 2: Build
FROM node:18-alpine AS builder
WORKDIR /app

# Copy dependencies from deps stage
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# Build the application
RUN yarn build

# Stage 3: Production
FROM node:18-alpine AS runner
WORKDIR /app

ENV NODE_ENV production

# Create a non-root user for security
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

# Copy necessary files for running the app
COPY --from=builder /app/public ./public
COPY --from=builder /app/.next ./.next
COPY --from=builder /app/node_modules ./node_modules
COPY --from=builder /app/package.json ./package.json

# Set the correct permission for nextjs user
USER nextjs

# Expose the listening port
EXPOSE 3000

# Set the environment variable for the port
ENV PORT 3000

# Run the application
CMD ["yarn", "start"]