fix: override NODE_ENV=development for npm install in Coolify

Coolify injects ARG NODE_ENV=production which causes npm to skip
devDependencies (typescript, tailwindcss, postcss).

Dockerfile

@@ -1,10 +1,13 @@
 FROM node:20-alpine AS builder
+ARG NODE_ENV=production
+ENV NODE_ENV=development
 WORKDIR /app
 COPY package.json package-lock.json* ./
 COPY packages/shared/package.json ./packages/shared/
 RUN npm install
 COPY packages/shared/ ./packages/shared/
 COPY . .
+ENV NODE_ENV=production
 RUN npx next build
 
 FROM node:20-alpine AS runner