Update archiver to uv

[phwissmann]

A couple of maintenance items:

• Introduce UV also in the archiver in order to aligned with the rest of the repository
  - Use specific and configurable user in docker container that writes to/reads from the LTS; these are the permission flags set on the files in the LTS and therefore need to be consistent
• Improved CI by adding test report and run steps conditionally

[pulsargranular]

Although I don't understand everything, it looks good to me!
I would suggest to move all the prefect stuff in its own folder, so we can get rid of some file prefixes, e.g.

• prefect-config.py
• prefect-vars.toml
• prefect-config.Dockerfile

[pulsargranular]

Lots of changes in this PR and only a few of them are related to «update archiver to uv».

[phwissmann]

Lots of changes in this PR and only a few of them are related to «update archiver to uv».

Move out important changes to new PR #154

[phwissmann]

Although I don't understand everything, it looks good to me! I would suggest to move all the prefect stuff in its own folder, so we can get rid of some file prefixes, e.g.

• prefect-config.py
• prefect-vars.toml
• prefect-config.Dockerfile

Makes sense. Done.