Prior to this commit, if the args key was a string rather than an array
of strings, the `join` command would fail when appending the arguments
to the run command for a given script. This commit updates that by
ensuring the `args` option is an array prior to joining the arguments.
Prior to this commit, the run trigger option wouldn't catch for failures
outside of the #Subprocess.execute raising exceptions. This commit fixes
that by inspecting the exit code result of the subprocess and using the
new `exit_codes` option to determine how to move forward with the
trigger.
