write docker config

dockers/Dockerfile

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+# Use Image Node Alpine For Build
+FROM node:13.14.0-alpine3.10
+
+# Default Working Directory
+WORKDIR /home/app/app
+
+# Copy Build Directory To Public Directory in Docker 
+COPY build public
+
+# Copy server.js To server , we open server from here
+COPY ./dockers/server.js ./server.js
+
+# Copy package.json for server to docker package json
+COPY ./dockers/server.package.json ./package.json
+
+# install express , for open server 
+RUN npm install express
+
+
+

dockers/server.package.json

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+{
+  "name": "react-heroku",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^4.2.4",
+    "@testing-library/react": "^9.3.2",
+    "@testing-library/user-event": "^7.1.2",
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1",
+    "react-scripts": "3.4.1"
+  },
+  "scripts": {
+    "start-app": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject",
+    "start": "node server.js"
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}