fat-catTW opened a new pull request, #71180:
URL: https://github.com/apache/airflow/pull/71180
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## Why
Dag authors currently cannot choose a radio button UI for enum Params in the
Trigger Dag form. This makes small, fixed choice sets less convenient,
especially when the choices are generated from deployment-local configuration
such as an INI file.
## Solution
Add an opt-in `x-airflow-ui.widget = "radio"` schema hint for enum Params.
Enum Params continue to render as dropdowns by default, while Params with the
radio widget hint render as radio buttons.
The Params documentation and tutorial Dag also show how to generate enum
choices from a colocated INI file at Dag parse time, so the Trigger Dag form
uses serialized Dag Params instead of calling a dynamic choice provider.
Helps address #56632.
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