auto_scripts smart attribute

[johrstrom]

The new job composer, for convienence is going to need an automatic smart attribute that can collect all the shell scripts in the project directory.

So, given this configuration:

form:
  - auto_scripts
attributes:
  auto_scripts:
    project_directory: '/path/to/some/directory'

The resulting smart_attribute should then generate a list of options from Dir.glob("#{project_directory}/*.{sh,bash}")

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