Prepare a release system for OVF images

[teon]

OVF is an open standard well documented of virtual images.
Some of our customer would like to have those images to easly and quickly deploy defguard in their infrastructure on Proxmox/VMWARE/etc..

Prepare a pipeline that will:

• build OFV image for each component with minimal system (debian?) just using our packages with some default random network (like: 10.11.12.0/24) - since we need to know the IPs of core/proxy (explain that in docs)
• add to /etc/hosts internal domains with these IPs - so that when someone would like to change IPs of the virtual machines - the only thing required for the whole stack to work is to change the host entries and there will be no need for reconfiguration of core/proxy/gw
• publish images of gw/core/proxy
• add documentation how to use it (we may have a default admin pass for ease of use and inform it requires changin) and how to change the IP of all components if someone want's to use it on production