Develop a custom script that triggers unit tests on Cloud Run immediately after a push to the development branch, ensuring tests are run in an isolated environment.

Utilize Cloud Build to automatically trigger and execute the unit tests upon each push to the development branch, leveraging its integration with Cloud Source Repositories for seamless operation.

Implement a Cloud Logging sink to capture repository interactions, route these logs to a Pub/Sub topic, and use a Cloud Function triggered by Pub/Sub messages to execute the unit tests, adding complexity for logging and monitoring.

Configure a Cloud Scheduler job that periodically checks the development branch for new pushes and executes the unit tests on Cloud Run, introducing delays in feedback.

Combine Cloud Build for immediate test execution upon push and Cloud Functions for additional logging and monitoring capabilities, ensuring both speed and observability.