VPC Dual Stack: Add support for IPv6 VPC in linode_interface resource

[lgarber-akamai]

📝 Description

This pull request adds support for Dual Stack VPC Linode Interfaces in the linode_interface resource.

Depends on #2087

✔️ How to Test

The following test steps assume you have pulled down this PR locally and are pointing at a Linode account that has access to VPC Dual Stack and Linode Interfaces. See TPT-3535 for more details.

Integration Testing

make PKG_NAME=linodeinterface test-int

Manual Testing

1. In a terraform-provider-linode sandbox environment, apply the following configuration:

provider "linode" {
  api_version="v4beta"
}

resource "linode_interface" "vpc" {
  linode_id = linode_instance.test.id

  vpc = {
    subnet_id = linode_vpc_subnet.test.id
    ipv6 = {
      is_public = true

      slaac = [
        {
          range = "auto"
        }
      ]

      ranges = [
        {
          range = "auto"
        }
      ]
    }
  }
}

resource "linode_instance" "test" {
  label = "tf-test-manual"
  region = "no-osl-1"
  type = "g6-nanode-1"
  interface_generation = "linode"
}

resource "linode_vpc" "test" {
  label = "tf-test-manual"
  region = "no-osl-1"
  ipv6 = [
    {
      range = "auto"
    }
  ]
}

resource "linode_vpc_subnet" "test" {
  vpc_id = linode_vpc.test.id
  label = "tf-test-manual"
  ipv4 = "10.0.0.0/24"
  ipv6 = [
    {
      range = "auto"
    }
  ]
}

resource "linode_instance_config" "my-config" {
  linode_id = linode_instance.test.id
  label = "tf-test-manual"

  device {
    device_name = "sda"
    disk_id = linode_instance_disk.boot.id
  }

  booted = false
}

resource "linode_instance_disk" "boot" {
  label = "boot"
  linode_id = linode_instance.test.id
  size = linode_instance.test.specs.0.disk

  image = "linode/alpine3.21"
  root_pass = "myc00lp4xssadass!!!!!!!"
}

2. Make arbitrary updates to the interface's IPv6 configuration.
3. Re-apply the configuration and ensure it updates successfully.
4. Plan the configuration and ensure no changes are proposed.

[Copilot]

Pull Request Overview

This PR adds support for IPv6 VPC Linode Interfaces in the linode_interface resource, implementing Dual Stack VPC functionality. This enhancement allows users to configure IPv6 addresses through SLAAC and static ranges on VPC interfaces.

• Adds IPv6 configuration support to VPC interfaces with SLAAC and range options
• Introduces comprehensive test coverage for IPv6 VPC interface functionality
• Updates documentation with IPv6 configuration examples and reference material

Reviewed Changes

Copilot reviewed 15 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
linode/vpcips/framework_models.go	Refactored ConfigID handling logic
linode/nb/tmpl/vpc.gotf	Added IPv6 configuration to VPC and subnet templates
linode/linodeinterface/tmpl/	New test templates for IPv6 VPC interface configurations
linode/linodeinterface/framework_vpc_models.go	Added IPv6 data models and processing logic for VPC interfaces
linode/linodeinterface/framework_resource_test.go	New integration test for IPv6 VPC interface functionality
linode/linodeinterface/framework_resource_schema.go	Added IPv6 schema attributes for VPC interfaces
linode/linodeinterface/framework_resource.go	Minor logging attribute reordering
linode/linodeinterface/framework_models.go	Updated interface flattening to handle IPv6 null objects
docs/	Updated documentation with IPv6 configuration examples and reference

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[Copilot]

Pull Request Overview

Copilot reviewed 15 out of 19 changed files in this pull request and generated 2 comments.

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_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Pull Request Overview

Copilot reviewed 15 out of 19 changed files in this pull request and generated 3 comments.

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_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Pull Request Overview

Copilot reviewed 15 out of 19 changed files in this pull request and generated 3 comments.

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_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Pull Request Overview

Copilot reviewed 14 out of 18 changed files in this pull request and generated 2 comments.

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_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Pull Request Overview

Copilot reviewed 14 out of 18 changed files in this pull request and generated 2 comments.

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