Feature / Added Support for Dev Containers (GitHub Codespaces)

[nitya]

Purpose

Dev Containers provides configuration-as-code support for developer environment setup.
Launch repo in GitHub Codespaces (cloud) or Docker Desktop (local) for quickstart setup. This PR adds the .devcontainer/ folder with initial configuration files that match other azd templates for AI projects.

A second (minor) change involves making postprovision scripts executable so they can be automatically run as azd hooks from the command-line in a dev container environment

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[X] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

Click the "Code" tab in GitHub repository (in browser) to launch the repository.
If container setup is valid, you will get a VS Code editor (in browser) with Docker container runtime backend (in cloud) with dev environment already setup.

Once the Codespaces is launched, you can complete the setup in 2 steps:

azd auth login
azd up

• Test the code

The test of the code lies in the ability to see a working Visual Studio Code editor environment connected to a Docker instance running in cloud (GitHub Codespaces) or local (Docker Desktop).

What to Check

Verify that your environment has the necessary tools installed correctly.

• Python 3.11+ - python --version
• Azure Developer CLI 1.9+ - azd version
• Azure CLI 2.6+ - az version
• Prompt Flow 1.11+ - pf version