Enhancements to managed identity updates

[davidxw]

This pull request includes several updates to improve the deployment and local development experience for the Azure Chat application. The most important changes include adding support for managed identities, simplifying the deployment process using the Azure Developer CLI, and enhancing the local development setup scripts.

Deployment and Local Development Improvements:

• Managed Identities Support:

  • Added add_localdev_roles.ps1 and add_localdev_roles.sh scripts to grant necessary IAM roles for local development. [1] [2]
  • Updated infra/resources.bicep to conditionally include secrets in Key Vault and app settings based on the disableLocalAuth flag. [1] [2] [3] [4] [5] [6] [7] [8] [9]

• Azure Developer CLI Deployment:

  • Added instructions to docs/4-deploy-to-azure.md for deploying the application using the Azure Developer CLI.

• Local Development Setup:

  • Updated docs/2-run-locally.md to include a note on using the Azure Developer CLI to populate environment variables.
  • Added appreg_setup.sh script for creating app registrations in Entra ID for local development.

Documentation Updates:

• README.md:
  • Updated to include both appreg_setup.ps1 and appreg_setup.sh scripts for creating app registrations.

Code Enhancements:

• Authentication:
  • Updated src/features/auth-page/auth-api.ts to dynamically set the isAdmin property based on a list of admin emails.

[olafwrieden]

Looks really useful, just made a few callouts as I was reading through :)