Containerise question service

Add Dockerfile for backend question service

Author: feliciagan

backend/question-service/.dockerignore

@@ -0,0 +1,4 @@
+node_modules
+tests
+.env*
+*.md

backend/question-service/Dockerfile

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+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+
+RUN npm install
+
+COPY . .
+
+EXPOSE 3000
+
+CMD ["npm", "start"]