Update JSON schema to include command.variables

[DannyBen]

Update schema for #563

[DannyBen]

@EmilyGraceSeville7cf, I have added a new possible value for command called variables.

It is an array of dictionaries, and each item must have a name and an optional value. The value can be pretty much anything:

    variables:
    # Simple value
    - name: output_folder
      value: output

    # Array
    - name: download_sources
      value:
      - youtube
      - instagram

    # Associative array
    - name: zip_options
      value:
        pattern: "*.json"
        compression_level: fast

So I did not limit the value to any particular type.
Note that bashly.json schema is auto-generated from the bashly.yaml schema.

Your approval por favor.

[EmilyGraceSeville7cf]

LGTM, just have some questions and comments 😄

[EmilyGraceSeville7cf]

I would also add minItems: 1. It is the matter of the answer to the following question: Should we remind the user that something is expected in an array of let it go (if an empty array is not an error in config)?

[DannyBen]

I have added minItems: 1 and updated some other arrays that had minLength instead of minItems.

[EmilyGraceSeville7cf]

What if the variable value is null ? Is it an error? What it corresponds to in Bash (in the context of Bashly) if it's not?

[DannyBen]

null is allowed (it will be null if not provided), and the bash variable definition will simply be varname="".

[DannyBen]

Thanks @EmilyGraceSeville7cf - merging.