fix: install typescript for next.config.ts transpilation in Dockerfile

Dockerfile

@@ -3,7 +3,7 @@ WORKDIR /app
 COPY package.json package-lock.json* ./
 RUN npm install
 COPY . .
-RUN npx next build
+RUN npm install --save-dev typescript && npx next build
 
 FROM node:20-alpine AS runner
 WORKDIR /app