Use Debian base image in Dockerfile to fix lightningcss on Alpine

Dockerfile

@@ -1,52 +1,52 @@
-# Multi-stage Dockerfile for Next.js Application
+# Multi-stage Dockerfile for Next.js Application (Debian-based to avoid musl issues)
+# Builder installs ALL deps (including dev) to support Tailwind/PostCSS during build
 
 # Build stage
-FROM node:24-alpine AS builder
+FROM node:24-bookworm-slim AS builder
 
-# Set working directory
 WORKDIR /app
 
-# Copy package files
-COPY package*.json ./
+ENV NODE_ENV=development
+ENV NEXT_TELEMETRY_DISABLED=1
 
 # Install dependencies
-RUN npm ci --only=production
+COPY package*.json ./
+RUN npm ci
 
-# Copy source code
+# Copy source
 COPY . .
 
 # Build the Next.js application
-RUN npm run build -- --no-turbopack
+RUN npm run build
 
 # Production stage
-FROM node:24-alpine AS production
+FROM node:24-bookworm-slim AS runner
 
-# Set working directory
 WORKDIR /app
 
-# Create non-root user
-RUN addgroup -g 1001 -S nodejs && \
-    adduser -S nextjs -u 1001
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
 
-# Copy dependencies from builder stage
-COPY --from=builder /app/node_modules ./node_modules
+# Install curl for healthcheck
+RUN apt-get update && apt-get install -y --no-install-recommends curl \
+  && rm -rf /var/lib/apt/lists/*
+
+# Install only production deps
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+# Copy built assets and public files
 COPY --from=builder /app/.next ./.next
-COPY --from=builder /app/package.json ./package.json
-
-# Copy source code
-COPY --from=builder /app/.env ./.env
 COPY --from=builder /app/public ./public
 
-# Change ownership
-RUN chown -R nextjs:nodejs /app
-USER nextjs
+# Use non-root user provided by the official Node image
+USER node
 
-# Expose port
 EXPOSE 3000
 
 # Health check
-HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
-  CMD curl -f http://localhost:3000/health || exit 1
+HEALTHCHECK --interval=30s --timeout=30s --start-period=10s --retries=3 \
+  CMD curl -f http://localhost:3000/ || exit 1
 
 # Start command
 CMD ["npm", "start"]