Add text from file

# From https://github.com/espanso/espanso/discussions/1908

  - trigger: :test
    replace: "{{output}}"
    vars:
      - name: output
        type: script
        params:
          args:
            - python
            - -c
            - |
              with open("/home/stephen/temp/br.txt", "r") as f:
                print(f.read())