No way to support conditional arguments in generate-monitor due to variable auto-quoting

[adalessandro]

Related to https://gitlab.collabora.com/obs/ci-to-obs/-/merge_requests/26

The above MR aims to add support to conditionally download OBS results.
The idea is to have a CI variable/flag for this setting, then call generate-monitor with the proper parameters, adding/removing --download-build-results-to accordingly.

However, because of the limited syntax provided by the obs-runner, it doesn't seem to be possible at the moment.

From https://github.com/collabora/obs-gitlab-runner?tab=readme-ov-file#supported-syntax

There is no way to use a variable without auto-quoting its contents.

Calling generate-monitor with an empty quoted string will make it fail parsing arguments:

- >
  generate-monitor $OBS_RUNNER_TAG
    --artifact-expiration '3 days'
    ''

Calling generate-monitor with option --download-build-results-to '' will make it download results to the current directory.

Due to variable auto-quoting in the obs-runner, apparently there's no way to support this kind of variable based conditional arguments.