closer to running

frontend/Dockerfile

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+# 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
+WORKDIR /app
+RUN npm install -g serve
+COPY --from=build /app/build /app/public
+CMD serve -s public -l 3000