i want to create pipeline that will show prod stage only for release/ branches. I developed yaml like this:

trigger:
- main

pr:
- main

stages:
- template: templates/infra-terraform-deploy.yml@templates
  parameters:
    # parameters

- template: templates/infra-terraform-deploy.yml@templates
  parameters:
    # parameters

- ${{ if startsWith( variables['Build.SourceBranchName'], 'refs/heads/release' ) }}: 
  - template: templates/infra-terraform-deploy.yml@templates
    parameters:
      # parameters

But unfortunately, last stage is always not present in my pipeline.

How to construct yaml pipeline in Azure Devops that will show last stage only for branches that starts with release?