Add Azure Credentials

[M3GH4NN]

Set GitHub Secrets of Azure Credentials to environment variables

[nicholasmhughes]

question (blocking): The PR introduces a new job to encode AZURE_* secrets and pass them to subsequent jobs, yet GitHub Actions inherently supports the use of encrypted secrets directly in the workflow. GitHub Actions workflows have built-in support for securely handling secrets without the need for explicit encoding or intermediate steps. Given that the AZURE_* secrets are already configured in the GitHub repository settings, the tests should be able to access these secrets directly, provided the necessary permissions are set. This raises the question of whether the additional complexity introduced by the credentials job is necessary.