init

Dockerfile

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+# Base on official Node.js Alpine image
+FROM node:18-alpine AS builder
+
+# Set working directory
+WORKDIR /app
+
+# Copy package.json and package-lock.json before other files
+# Utilize Docker cache to save re-installing dependencies if unchanged
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci
+
+# Copy all files
+COPY . .
+
+# Define build arguments with defaults
+ARG NEXT_PUBLIC_SUPABASE_URL
+ARG NEXT_PUBLIC_SUPABASE_ANON_KEY
+
+# Set environment variables from build arguments
+ENV NEXT_PUBLIC_SUPABASE_URL=$NEXT_PUBLIC_SUPABASE_URL
+ENV NEXT_PUBLIC_SUPABASE_ANON_KEY=$NEXT_PUBLIC_SUPABASE_ANON_KEY
+
+
+# Build app
+RUN npm run build
+
+# Production image, copy all the files and run next
+FROM node:18-alpine AS runner
+
+WORKDIR /app
+
+# Set to production environment
+ENV NODE_ENV=production
+
+# Add user so we don't run as root
+RUN addgroup --system --gid 1001 nodejs \
+    && adduser --system --uid 1001 nextjs
+
+# Copy built app
+COPY --from=builder --chown=nextjs:nodejs /app/.next ./.next
+COPY --from=builder --chown=nextjs:nodejs /app/node_modules ./node_modules
+COPY --from=builder --chown=nextjs:nodejs /app/package.json ./package.json
+COPY --from=builder --chown=nextjs:nodejs /app/public ./public
+
+# Switch to non-root user
+USER nextjs
+
+# Expose port
+EXPOSE 3000
+
+# Start the app
+CMD ["npm", "start"]
+
+# Note: When running the container, override environment variables with:
+# docker run -p 3000:3000 -e NEXT_PUBLIC_SUPABASE_URL=your_url -e NEXT_PUBLIC_SUPABASE_ANON_KEY=your_key nextjs-slack-clone
+# Note: These lines correctly declare and set up build arguments.
+# To load values for these arguments from a file, you would use
+# external mechanisms (like a shell script parsing an .env file and passing
+# --build-arg flags, or Docker Compose with its .env file handling)
+# when invoking `docker build`. The Dockerfile itself does not need changes
+# for this purpose.