Support for provisioning Gardener with Shared VPC in GCP

[kapilraju]

/area networking
/kind enhancement
/priority 1
/platform gcp

What would you like to be added:
Gardener doesn't support creating Kubernetes cluster using GCP shared VPC. It fails to create the cluster because gardener cannot detect exported subnets(shared-vpc) in GCP service project and it detects only VPCs created locally in the service project

Why is this needed:
Shared VPC lets organization administrators to delegate administrative responsibilities to Service Project Admins(such as creating and managing instances) while maintaining centralized control over network resources like subnets, routes, and firewalls.

Using Shared VPC is also a Google recommended architecture

[gardener-robot]

@kapilraju You have mentioned internal references in the public. Please check.

[prashanth26]

Duplicate of #262?

[kapilraju]

@prashanth26 Yes, this duplicate of #262

[prashanth26]

/close in favour of #262

[kapilraju]

@prashanth26 Can you please reopen this and close #262 , i don't have edit privilege for #262 to make changes to that post

[kapilraju]

@vlerenc @prashanth26

Do you need any additional information to consider this feature request?

[vpnachev]

@prashanth26 Can you please reopen this and close #262 , i don't have edit privilege for #262 to make changes to that post

But you can comment which is fine.

[prashanth26]

@prashanth26 Can you please reopen this and close #262 , i don't have edit privilege for #262 to make changes to that post

Is there any specific reason for this? If it's to add more description, feel free to comment on the other issue.

@vlerenc @prashanth26

Do you need any additional information to consider this feature request?

No. We will try to pick this up.