fixes an issue with binary compatibility on headers mod
fixes an issue with binary compatibility on headers mod

* modules needs to be compiled with the very same settings, see nginx -V
** uses apk packages from nginx dockerfile

* doesn't overwrite existing modules, should therefore only copy new modules if both use the same base image

NOTE

* https://www.oodlestechnologies.com/blogs/Setup-Headers-More-Nginx-Module-Using-Dynamic-Compilation

encodeering/docker-owncloud