OIDC support for sovereign clouds

[arnoldna]

Added OIDC support for AzureUSGovernment and AzureChinaCloud

ISSUE #257- #257

[BALAGA-GAYATRI]

@arnoldna Thanks for the PR. Can you add more details on the tests that were done for this PR?

[arnoldna]

I have access to an AzureUSGovernment subscription and tested connectivity utilizing the following yaml:

`name: Run Azure Login with OpenID Connect
on: [push]

permissions:
id-token: write
contents: read

jobs:
build-and-deploy:
runs-on: ubuntu-latest
steps:
- name: 'Az CLI login'
uses: azure/login@v1
with:
client-id: ${{ secrets.AZURE_CLIENT_ID }}
tenant-id: ${{ secrets.AZURE_TENANT_ID }}
subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}
environment: 'AzureUSGovernment'

- name: 'Run Azure CLI commands'
  run: |
      az account show
      az group list
      pwd`

If there are other tests you would like to run then let me know.

[jpmicrosoft]

@BALAGA-GAYATRI Any updates on this PR?

[github-actions]

This PR is idle because it has been open for 14 days with no activity.

[jpmicrosoft]

Approved

[BALAGA-GAYATRI]

We are following up on the same. Will get back with the info.

[arnoldna]

@BALAGA-GAYATRI - Can we get an update on when this PR will be approved? Thanks

[github-actions]

This PR is idle because it has been open for 14 days with no activity.

[some-natalie]

friendly bump on this ❤️

[devopsjesus]

Looks like the linting is failing on README - can someone please fix this and merge? PR has been open for months

[MoChilia]

Closing this pr, the feature is done in #321.

[jiasli]

resourceManagerEndpointUrl is in the output of az ad sp create-for-rbac --sdk-auth and az cloud list/show, so it shouldn't be hard-coded.

> az ad sp create-for-rbac --sdk-auth
{
  "clientId": "...",
  "clientSecret": "...",
  "subscriptionId": "...",
  "tenantId": "...",
  "activeDirectoryEndpointUrl": "https://login.microsoftonline.com",
  "resourceManagerEndpointUrl": "https://management.azure.com/",
  "activeDirectoryGraphResourceId": "https://graph.windows.net/",
  "sqlManagementEndpointUrl": "https://management.core.windows.net:8443/",
  "galleryEndpointUrl": "https://gallery.azure.com/",
  "managementEndpointUrl": "https://management.core.windows.net/"
}