Install the Microsoft Teams app for GitHub and configure a repository subscription to send commit alerts to the channel is the correct choice.

The Microsoft Teams app for GitHub provides a built in connector that can subscribe a channel to repository events and post commit notifications directly to the specified Teams channel with minimal configuration and little to no custom code or ongoing maintenance.

Deploy an Azure Function to poll the GitHub API and post commit messages to the Teams channel is not ideal because polling requires custom code and continuous maintenance and it is less efficient than event driven integrations.

Use Microsoft Power Automate to subscribe to GitHub events and forward commit notifications to the Teams channel could deliver notifications but it introduces an extra service and potential licensing or complexity and it is not the simplest low maintenance option compared with the native Teams app.

Create a GitHub Actions workflow that calls the Teams API to send messages when commits are pushed would work but it requires creating and maintaining custom workflows and secrets and it adds ongoing operational overhead compared with the built in Teams integration.

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