Added docker file

.dockerignore

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+node_modules
+npm-debug.log
+build
+.dockerignore

Dockerfile

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+FROM node:16.19.0-alpine as build
+WORKDIR /app
+COPY package.json ./
+COPY yarn.lock ./
+RUN yarn
+COPY . .
+RUN yarn build
+# production environment
+FROM nginx:stable-alpine
+COPY --from=build /app/build /usr/share/nginx/html
+COPY --from=build /app/nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]