Workflow dispatch inputs and defaults with other on: trigger events

action.yml

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:
    inputs:
      build_run_id_to_deploy:
        description: 'the build run id to download for deploy'
        required: true
        default: '1703586018' 

env:
  build_run_id_to_deploy: '1703586018'

...

    - name: download workflow artifact
      uses: benday-inc/download-artifact@main
      with:
         run_id: ${{ github.event.inputs.build_run_id_to_deploy == '' && env.build_run_id_to_deploy || github.event.inputs.build_run_id_to_deploy }}