ci: update image tag to latest_waf

[Harsh-Microsoft]

Purpose

This pull request updates the default Docker image tag from latest to latest_waf across deployment scripts, documentation, and infrastructure configuration. The change ensures consistency in the image tag used throughout the deployment process, reflecting a likely shift to a new default image version. This impacts both the actual deployment behavior and the guidance provided to users.

Deployment pipeline and infrastructure updates:

• Changed the default image tag from latest to latest_waf in the containerImageTag parameter in infra/main.bicep, ensuring new deployments use the updated image by default.
• Updated GitHub Actions workflows (.github/workflows/CAdeploy.yml and .github/workflows/build-docker.yml) to assign latest_waf as the image tag when deploying from the main branch, instead of latest. [1] [2]

Documentation updates:

• Updated the default and allowed values for the image tag in docs/CustomizingAzdParameters.md and docs/DeploymentGuide.md from latest to latest_waf, ensuring documentation matches the new deployment behavior. [1] [2]

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• ...

Other Information

[github-actions]

🎉 This PR is included in version 1.9.0 🎉

The release is available on GitHub release

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