Dockerfile to create a simple nginx healthcheck container that responds to /up

Dockerfile

FROM nginx

RUN <<EOF 
echo "server {
    listen       80;
    server_name  localhost;

    location /up {
        default_type text/plain;
	return 200 "OK";
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}" > /etc/nginx/conf.d/default.conf
EOF