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<@ULVA73B9P> how do you set an environment variable in a worker pool from the CLI?  currently I’m running `prefect worker start --pool test` but then have to configure the environment variable in the UI to set the `PREFECT_API_URL`, I’d like to be able to do it in one line on the CLI.

To set an environment variable like `PREFECT_API_URL` in a worker pool directly from the CLI, it's important to understand how Prefect manages environment variables and worker configurations. Here’s what you need to know:

1. *Prefect Version 2.x*: 
   - Prefect allows the configuration of job variables (like environment variables) for each work pool, applicable to all deployments associated with the pool. However, it seems that setting these directly via the CLI isn't typically supported in a straightforward one-liner when starting a worker. It is often configured during the work pool setup in the UI or through configuration files such as `prefect.yaml`.
   - Source: <https://docs-2.prefect.io/latest/guides/deployment/overriding-job-variables/|Overriding Work Pool Job Variables in Prefect 2>.

2. *Prefect Version 3.x*:
   - Similar to version 2.x, setting environment variables like `PREFECT_API_URL` is generally expected to be part of the broader configuration via profiles or through deployment scripts/configurations that set the necessary environment variables before starting the worker.
   - There's no direct CLI command for setting these on the fly during the worker start command, but environment variables in general take precedence over values in profiles, indicating such variables should be set in the shell environment where you start the worker.
   - Source: <https://docs-3.prefect.io/3.0/manage/settings-and-profiles|Prefect 3.x Settings and Profiles>.

If you need to script the setup for a more automated environment, you might consider a shell script that exports the necessary environment variable before running the `prefect worker start` command:

```sh
export PREFECT_API_URL="YOUR_API_URL"
prefect worker start --pool test
```

Make sure your environment variables are set in the shell session from which you're starting the worker.

For the most effective configuration, refer to the specific Prefect documentation for <https://docs-2.prefect.io/|2.x> and <https://docs-3.prefect.io/|3.x> as they provide guides tailored to configuring workers and environment variables based on that version.