added Dockerfile

Dockerfile

@@ -0,0 +1,16 @@
+FROM alpine:latest as build
+
+RUN apk add --update nodejs npm
+RUN npm install --global yarn
+
+COPY ['.', '/usr/src']
+WORKDIR /usr/src
+
+RUN yarn
+RUN yarn build REACT_APP_ENV_MODE=${REACT_APP_ENV_MODE}
+
+FROM nginx:1.23.1-alpine
+EXPOSE 80
+COPY ./docker/nginx/conf.d/default.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /usr/src/build /usr/share/nginx/html
+CMD ["nginx", "-g", "daemon off;"]