Added dockerfile

backend-services/comment-service-2/Dockerfile

+FROM node:latest as base
+
+# Create app directory
+WORKDIR /comment-service-2/app
+
+COPY package*.json ./
+RUN  npm install
+
+# Bundle app source
+COPY . .
+
+EXPOSE 9000
+
+CMD [ "npm", "run", "start:dev" ]
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