Dropdown for GitHub Workflows input parameters

I want to create a dropdown list for my GitHub Action Input parameter. This should help in selecting a value from the dropdown just like how the option is there to select the branches.

When using workflow_dispatch, it's now possible to have choice, boolean and environment inputs instead of only just strings. choice is a dropdown, boolean is a checkbox and environment is like choice but will auto-populate with all environments configured in your repos settings.

Here's an example workflow using the new types:

name: CI

on:
  workflow_dispatch:
    inputs:
      environment:
        type: environment
        description: Select the environment
      boolean:
        type: boolean
        description: True or False
      choice:
        type: choice
        description: Make a choice
        options:
        - foo
        - bar
        - baz
jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2

      - name: greet
        run: | 
          echo "environment is ${{ github.event.inputs.environment }} / ${{ inputs.environment }}"
          echo "boolean is ${{ github.event.inputs.boolean }}" / ${{ inputs.boolean }} 
          echo "choice is ${{ github.event.inputs.choice }}" / ${{ inputs.choice }}

Note that inputs can now be accessed directly using the inputs context, instead of using github.event.inputs.