Is this your first time submitting a feature request?

• I have read the expectations for open source contributors
• I have searched the existing issues, and I could not find an existing issue for this feature
• I am requesting a straightforward extension of existing dbt functionality, rather than a Big Idea better suited to a discussion

Describe the feature

How about supporting DBT_SELECTOR as an environment variable for --selector?

Looks like it could make sense, and makes using predefined selectors a little smoother in some setups.

Describe alternatives you've considered

No response

Who will this benefit?

People setting up pipelines invoking dbt, where it's easier & more robust to set different single-purpose environment variables than building up the cli arguments.

Are you interested in contributing this feature?

Yes (see PR #12194).

Anything else?

No response