Enhance two-phase container app deployment instructions with terraform

[JasonYeMSFT]

Test runs revealed a gap in the existing two-phase container app deployment instructions in azure-prepare, azure-deploy skill chain:

• This commonly loaded reference file only mentions two-phase deployment with Bicep. It doesn't have the counterpart for terraform. https://github.com/microsoft/GitHub-Copilot-for-Azure/blob/main/plugin/skills/azure-deploy/references/pre-deploy-checklist.md

In this linked test run, the agent didn't load any reference file that mentions using a placeholder for the two-step deployment for terraform. The plan file should have equivalent instructions for the terraform deployment path.

https://agreeable-dune-0f718070f.1.azurestaticapps.net/nightly-runs.html?file=2026-05-01%2F25208332123%2Fazure-deploy%2Fterraform-azure-container-apps-deploy%2Fazure-deploy_-_Integration_Tests_terraform-azure-container-apps-deploy_creates_social_media_application_with_Terraform_infrastructure%2Fagent-metadata-2026-05-01T10-17-36-505Z.md

[github-actions]

Thanks for filing this, JasonYeMSFT (@JasonYeMSFT)! 🙏

This has been labeled enhancement since it's requesting new Terraform guidance to complement the existing Bicep two-phase deployment content. Both azure-deploy and azure-prepare are applied as this gap spans the skill chain for container app deployment. integration-test is included since this was surfaced by an integration test run. Since the fix involves adding Terraform instructions to the reference files, assign-to-copilot has also been applied — a coding agent will look into adding the missing Terraform placeholder/two-phase deployment guidance to the relevant reference docs.

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