[FEATURE]: Add script alternative to command in exec task

[johnlane]

Feature Request

Background / Motivation

Writing tasks with multiple command and/or arguments is cumbersome and error-prone when adding to a command list. Compare with Gitlab CI jobs.

What should the user be able to do?

Instead of writing

command: [ 'ls', '-l']

It would be convenient to write

script: 
    - ls -l

It would allow multiple lines:

script:
    - ls -l
    - cat /var/log/messages

or even

script:
    - |
    ls -l
    cat /var/log/messages

(I used script here because (a) it's familiar and (b) it means command can remain as-is.)

Why do they want to do this? What problem does it solve?

This would greatly simplify entry of task commands.

Suggested Implementation(s)

As above

How important is this feature for you/your team?

🌵 Not having this feature makes using Garden painful