Update Dockerfile

Author: RohanRusta21

frontend/Dockerfile

@@ -1,6 +1,7 @@
 FROM node:8
 LABEL Maintainer="Rohan"
 WORKDIR /app
+ARG release=1.0.0
 RUN npm install -g @angular/cli@1.7.3
 COPY package*.json ./
 RUN npm install