refactor: update credential retrieval logic based on environment

[Akhileswara-Microsoft]

Purpose

This pull request updates the logic for obtaining Azure credentials in the image_service.py service to better distinguish between development and production environments. The main change is to select the credential type based on the APP_ENV environment variable, improving local development experience and deployment flexibility.

Credential selection improvements:

• Updated the _get_credential function in image_service.py to use DefaultAzureCredential with require_envvar=True when APP_ENV is set to dev, and to use ManagedIdentityCredential with the configured client ID otherwise. This ensures that local development uses environment-based credentials, while production uses managed identity.
• Added an import for the os module to support reading environment variables.

Does this introduce a breaking change?

• Yes
• No

Other Information

This pull request updates the logic for obtaining Azure credentials in the image_service.py to better support different environments (development vs. production). The main change is to select the appropriate credential type based on the APP_ENV environment variable.

Credential selection improvements:

• Modified the _get_credential function to check the APP_ENV environment variable and use DefaultAzureCredential in development environments and ManagedIdentityCredential in production, improving environment-specific authentication handling.
• Added import os to support reading environment variables for credential selection.

[github-actions]

Coverage Report •

File	Stmts	Miss	Cover	Missing
TOTAL	3824	552	85%

report-only-changed-files is enabled. No files were changed during this commit :)

Tests	Skipped	Failures	Errors	Time
834	0 💤	0 ❌	0 🔥	9.973s ⏱️