Google Cloud VPC Firewall Factories

This collection of modules implement two different metodologies for the creation of VPC firewall rules, both based on leveraging well-defined yaml configuration files.

The flat module delegates the definition of all firewall rules metadata (project, network amongst other) to the individual yaml configuration. This module allows for maximum flexibility, and a custom logical grouping of resources which can be trasversal to the traditional resource hierarchy, and could be useful in scenarios where networking is not managed centrally by a single team.
The nested module requires and enforces a semantical folder structure that carries some of the rules metadata (project and network), and leaves the rest to each yaml configuration. This solution allows for the definition of a resource hierarchy that is aligned with the organisational resource structure.