add missing folder for nginx

Dockerfile

 FROM node:alpine 
 ARG NODE_ENV=production
-RUN mkdir /app && apk update && apk add curl gettext nginx
+RUN mkdir /app && apk update && apk add curl gettext nginx && mkdir /run/nginx
 COPY ./1.7.0.tar.gz /app
 WORKDIR /app
 RUN tar zxvf 1.7.0.tar.gz --strip 1 -C /app && \