feat(docker): add Dockerfile

Dockerfile

+FROM node:12 AS build
+
+ARG NODE_ENV=production
+
+RUN mkdir /src
+COPY . /src
+WORKDIR /src
+
+RUN yarn install
+RUN yarn generate
+
+FROM nginx:alpine
+
+COPY --from=build  /src/public /usr/share/nginx/html
+VOLUME /usr/share/nginx/html
+VOLUME /etc/nginx