Added support for developing the CLI on nixos

[jimurrito]

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This checklist is used to make sure that common guidelines for a pull request are followed.

Related command

n/a

General Guidelines

• Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• Have you run python scripts/ci/test_index.py -q locally? (pip install wheel==0.30.0 required)
• My extension version conforms to the Extension version schema

For new extensions:

• My extension description/summary conforms to the Extension Summary Guidelines.

About Extension Publish

There is a pipeline to automatically build, upload and publish extension wheels.
Once your pull request is merged into main branch, a new pull request will be created to update src/index.json automatically.
You only need to update the version information in file setup.py and historical information in file HISTORY.rst in your PR but do not modify src/index.json.

PR Notes

Added a shell.nix file to the root directory of the repo to allow for az-cli development on NixOS. With this file, developers who use NixOS via WSL are able to quickly setup a development environment needed for for the Az CLI. File is used with a command called nix-shell which generates a virtual environment for scenarios like this.

What does shell.nix do?

• Installs Python3.9
• Creates a python venv called env
• Connects to the venv
• Updates Pip
• Installs Azdev pip package

[azure-client-tools-bot-prd]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd]

Hi @jimurrito,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in setup.py as well.

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

[github-actions]

• For more info about extension versioning, please refer to Extension version schema