Add Dockerfile

backend/Dockerfile

@@ -0,0 +1,16 @@
+FROM node:20-alpine
+
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY . .
+
+ENV FRONTEND_ORIGIN=http://localhost:8000
+ENV PORT=8001
+
+EXPOSE $PORT
+
+RUN npx sequelize db:migrate
+RUN echo "Migration complete."
+
+CMD ["node", "index.js"]