more secure docker-compose example
more secure docker-compose example

Improvement of solution for #1714
* uses SSL encryption for registry
* uses SSL encryption for frontend
* uses nginx for serving portus

Signed-off-by: Stefan Weiberg <4840897089f6c37521a1233ab96e53700f78b683@suse.com>

mssola/Portus,SUSE/Portus,SUSE/Portus,mssola/Portus,SUSE/Portus,SUSE/Portus,mssola/Portus,mssola/Portus