Support workload identity federation and service principals

[Botje]

This PR adds support for using App Config with a federated identity and service principals. (via client secret)
The necessary inputs are styled after Azure/login.

[Botje]

Any chance this can get a review?

[ChristineWanjau]

@Botje Please pull the latest changes from main branch

[Botje]

I made the changes you suggested. Do you think it is worth creating a test for the "no auth-type set" scenario?

[ChristineWanjau]

@Botje I am just curious, are there any github actions that have used @azure/identity sdk to authenticate to azure? I see most of them recommend the use of @Azure/login.

[Botje]

I cannot find an NPM package named @Azure/login. Are you talking about the GitHub Action named Azure/login?
That action uses the az cli to log in, and many actions defer authentication to that, yes.

If you prefer that can be added as a fourth authentication mechanism.

[ChristineWanjau]

Hello @Botje we are deprecating this Github action. We recommend using Azure CLI action instead. Follow this guideline to https://learn.microsoft.com/en-us/azure/azure-app-configuration/push-kv-github-action on how to set it up. I am going to go ahead and close this pull request.