adding Admin server

admin/Dockerfile

@@ -0,0 +1,20 @@
+# build environment
+FROM node:13.12.0-alpine as build
+WORKDIR /app
+ENV PATH /app/node_modules/.bin:$PATH
+COPY package.json ./
+RUN npm install
+RUN npm install react-scripts@3.4.1 -g --silent
+COPY . ./
+RUN npm run build
+
+# production environment
+FROM node:13.12.0-alpine
+RUN mkdir -p /app/public
+COPY ./package.json /tmp
+RUN cd /tmp && npm install
+RUN cp -a /tmp/node_modules /app
+WORKDIR /app
+COPY server /app
+COPY --from=build /app/build /app/public
+CMD ["node", "index.js"]