Allow passing in the EIPs for the NAT gateways

[miguelaferreira]

The NAT Gateway IPs in my setup need to survive the terraform apply-destroy cycle because they are the interface to integrate my infrastructure with other infrastructures outside my control. More specifically, these IPs need to be whitelisted somewhere else for my system to work.

As it is now, if I build up my infrastructure, destroy it and build it again, I will get new IPs for the NAT Gateways. This poses a problem for me because whitelisting the new IPs has to go through a manual process.

To this end I would like to be able to allocate EIPs outside my plan, and pass those into the VPC module as input variables. I'm opening the issue to raise awareness to the problem and to promote a discussion about it. Maybe there are other ways of achieving this that I'm missing?

Meanwhile I'll work on a PR to address this problem.

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues. If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.