I would like to have dropdown list of input values:
on:
workflow_dispatch:
inputs:
project:
description: 'Environment'
required: true
options: ['production', 'staging', 'development']
default: 'development'
Like selecting a branch:
Hi @kestutisg,
Glad to see you in Github Community Forum! 
Currently option input list is not supported for workflow_dispatch event, there is no such option in rest api parameters.
It’s recommended to raise a feature request ticket in below link where github product manager will take a review.
https://support.github.com/contact/feedback?contact[category]=actions
Thanks
