Publish model as generic packages from CI

Closes #7 (closed)

Here is the CI script to upload doc-ufcn models as Gitlab generic packages, on every merge to main.

Here is a successful run, that published generic_page_detection @ 0.0.1

You can programmatically retrieve (for #8 (closed)) the files using these urls:

https://gitlab.com/api/v4/projects/PROJECT_ID/packages/generic/PACKAGE/VERSION/FILENAME

So for example: https://gitlab.com/api/v4/projects/30605923/packages/generic/generic_page_detection/0.0.1/parameters.yml