Command arguments as a list is not needed

[wigging]

The shell activity in the ImageMagick example is defined as shown here:

activity = ShellActivity(
    name="ImageMagick",
    files=[
        f"local://{curr_dir}/../tests/campaigns/imagesequence/{i:02d}.jpg"
        for i in range(1, 11)
    ],
    command="convert",
    arguments=[
        "-delay",
        "20",
        "-loop",
        "0",
        f"{curr_dir}/../tests/campaigns/imagesequence/*.jpg",
        "a.gif",
    ],
    logger=logger,
)

Instead of passing a list for the arguments, a string can be split into a list of items such as:

arguments=f"-delay 20 -loop 0 {curr_dir}/../tests/campaigns/imagesequence/*.jpg a.gif".split(" ")

So the arguments parameter could actually be made to require a string instead of a list (see below). This would make it easier for the user so they don't have to manually provide individual argument items. If a list is required within the activity class, then the string can be split into a list.

arguments=f"-delay 20 -loop 0 {curr_dir}/../tests/campaigns/imagesequence/*.jpg a.gif"