Based graylog2 container with one additional fix for
mime.types. Original graylog docker container has issue with missing mime.types file that causes spam from nginx at start with such message
nginx: [emerg] open() "/opt/graylog/conf/nginx/mime.types" failed (2: No such file or directory) in /opt/graylog/conf/nginx/nginx.conf:9
So we just inherit based graylog container and create empty
mime.types file to resolve that issue.