To get the GCP Cloud Run URL for a flow run in Prefect, you need to follow the steps outlined in the Google Cloud Run Worker Guide. The process generally involves creating a service account, setting up a Prefect work pool, deploying a Prefect worker as a Cloud Run service, and then executing your flow as a Cloud Run job. The URL for your deployed service can be found in the Google Cloud Console under the Cloud Run section after you've deployed your service.
Here are the guides for reference:
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Google Cloud Run Worker Guide
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Deploying a Prefect Worker as a Cloud Run Service
You won't get a specific URL for each flow run, but rather a general service endpoint URL from Cloud Run where your Prefect flows will be executed. You can then track the execution of your flow runs through the Prefect UI.