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hey all, how do we consume env vars in the prefect.yaml file? not a prefect variable

```{{ $MY_ENV_VAR }}```
<https://docs.prefect.io/2.14.3/guides/prefect-deploy/#templating-options>

```name: pipelines
prefect-version: 2.14.3

pull:
  - prefect.deployments.steps.set_working_directory:
      directory: /app/projects/pipelines

definitions:
  work_pools:
    dc_work_pool: &amp;dc_work_pool
      name: "{{ $WORK_POOL_NAME }}"
      job_variables:
        image: "{{ $REGISTRY }}/{{ $IMAGE_NAME }}:{{ $TAG }}"

deployments:
  - name: my_flow_docker_pool_2
    entrypoint: dc/pipelines/test_flow.py:my_flow
    work_pool: *dc_work_pool```
for some reason, reading an env var for the work pool name does not work

if i use that variable elsewhere, the yaml file is able to read it

```This deployment configuration references work pool '{{ $WORK_POOL_NAME }}' which does not exist. This
means no worker will be able to pick up its runs. You can create a work pool in the Prefect UI.```

fyi <@U02GMEZU18B> -- looks like someone else bumped into the same issue i have here:
<https://github.com/PrefectHQ/prefect/issues/10751>

perhaps there's a bug where the work pool name field can't read from env vars?

hmm not sure - i’ll try to see what’s going on with that today 

<@U02GMEZU18B> -- in the meantime, do you have a workaround for this? we want to be able to swap the work pool name out depending on the environment.

```definitions:
  work_pools:
    work_pool: &work_pool
      name: "{{ $WORK_POOL_NAME }}-{{ $ENV }}" # ideally we do something like this```

mm i tried this out and it looks like im not able to template into the `work_pool` `name` field for some reason, which seems like bug. so i agree with your (I presume) <https://github.com/PrefectHQ/prefect/issues/10751#issuecomment-1801757475|comment>

<@U02GMEZU18B> -- following up here :slightly_smiling_face:

hi jon i dont have time to look at this now but my hunch is that we'll need an issue / someone to pick it up here, bc it does appear we cannot template into the work pool name etc

if you could create a ticket that specifically addresses this problem (if not exists) i would appreciate it! we'll get on it asap

here ya go! <https://github.com/PrefectHQ/prefect/issues/11189>