Build GHAR Packer Cannot Use Bundled Plugins

[olivereri]

Description

Building Github Actions Runner AMIs never set required plugins like Base AMI builds did. The Build workflow had been reporting this error:

Warning: Bundled plugins used

This template relies on the use of plugins bundled into the Packer binary.
The practice of bundling external plugins into Packer will be removed in an
upcoming version.

To remove this warning, add the following section to your template:

packer {
  required_plugins {
    amazon = {
      source  = "github.com/hashicorp/amazon"
      version = "~> 1"
    }
  }
}

The payments on this technical debt are due. Simply add the required plugin to Build GHAR's variables.hcl file.

Related Issues

department-of-veterans-affairs/va.gov-cms#16240
https://github.com/department-of-veterans-affairs/devops/pull/13814

Testing done

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QA steps

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