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How can I reference Terraform cloud environmental variables?

I'm using Terraform cloud. I would like to take advantage of using AWS Tags with my resources. I want to tag each resource defined in Terraform with the current GIT Branch Name. That way I can separate dev from production.

Terraform has a list of Environmental Variables that do reference the GIT Branch Name with their service in the cloud as:

TFC_CONFIGURATION_VERSION_GIT_BRANCH - This is the name of the branch that the associated Terraform configuration version was ingressed from (e.g. master).

How can I reference the TFC_CONFIGURATION_VERSION_GIT_BRANCH environmental variable in the following resource for an example VPC?

resource "aws_vpc" "example_vpc" {
  cidr_block = "10.0.0.0/16"

  tags = {
    product = var.product
    stage = var.TFC_CONFIGURATION_VERSION_GIT_BRANCH
  }
}