feat: add --version flag for external debugging

[OmarIthawi]

Use as $ atlas --version which prints the tag version e.g. v0.1.1.

This workflow relies on the release.yml GitHub Action, otherwise $ atlas --version will print unreleased.

I might add https://github.com/semantic-release/semantic-release to this repo later on, but it's not yet on my priorities.

This contribution is part of the FC-0012 project which is sparked by the Translation Infrastructure update OEP-58.

TODO

• [x] Add a new tag: https://github.com/Zeit-Labs/openedx-atlas/actions/runs/5734875894/job/15541755451 which ran for https://github.com/Zeit-Labs/openedx-atlas/releases/tag/v0.1.2
• [x] Ensure the downloaded script shows the proper tag:

_ATLAS_VERSION="v0.1.2"  # Tagged by release.yml
    disp    _ATLAS_VERSION  --version
        echo "${_ATLAS_VERSION}"

[brian-smith-tcril]

@OmarIthawi the code here looks good, but I see you still have some unchecked todos. I think those are definitely things we should verify on this repo after merging this, but before merging it'd probably be good to verify on a fork.

[OmarIthawi]

@OmarIthawi the code here looks good, but I see you still have some unchecked todos. I think those are definitely things we should verify on this repo after merging this, but before merging it'd probably be good to verify on a fork.

Thanks @brian-smith-tcril for the reminder about the fork. I've done that and it looks good!