[Feature]: Allow to reuse parts of existing infrastructure

[pli01]

Explain problem to solve

Need to reuse part of existing pre deployed infrastructure with cluster-api Outscale deployment:

• reuse infrastructure resources (VPC, LB, subnet, nat, igw, public IP, bastion ..)
• to improve deployment time
• to reduce cost

Describe the solution you would like

Cluster-api provider outscale need to support the following:
reuse infrastructure parts, with ID or TAG

• preexisting VPC
• preexisting subnet (public or private)
• preexisting NAT or IGW
• preexisting LB
• preexisting bastion

Additional context

We need to deploy with multiple providers and predefined topology

for example, others cluster-api provider support it :

• cluster-api aws https://cluster-api-aws.sigs.k8s.io/topics/bring-your-own-aws-infrastructure#bring-your-own-aws-infrastructure
• cluster-api openstack https://cluster-api-openstack.sigs.k8s.io/clusteropenstack/configuration#use-existing-router

Environment

- Kubernetes version: (use `kubectl version`):
- OS (e.g. from `/etc/os-release`):
- Kernel (e.g. `uname -a`):
- cluster-api-provider-outscale version:
- cluster-api version:
- Install tools:
- Kubernetes Distribution:
- Kubernetes Diestribution version:

[alistarle]

Hi ! I also definitely need this feature. I see in the CRD we can pass resourceId in many object (net/subnet/igw...), have you tested it ?

I'm planning to do it in the following days so I will keep you updated