workflow_dispatch_arg.yml

name: WD argument

on:
  workflow_dispatch:
    inputs:
      force_met_image:
        description: 'MET DockerHub repo to force run to use, e.g. met:11.1.0 or met-dev:feature_XYZ_name-PR. Leave this blank to determine repo automatically.'

jobs:

  test_var:
    name: testing var
    runs-on: ubuntu-latest
    steps:
      - name: check value
        run: echo value is X${SET_MET_IMAGE}X
        env:
          SET_MET_IMAGE: ${{ github.event.inputs.force_met_image }}