Enhance the release process for API updates

Findings:

• the current daily update of the API / databases rebuild the entire API. It expose us to any breaking change that could happen in one of the hundreds of package dependencies RADIS.api rely on.
• integrating directly change in "main" branch break the entire API one out of two times

Solutions:

• create a preprod API service (eg. https://preprod.api.g-eau.fr) based on "dev" branch to test the new features and bug fixings
• remove the package build in the daily update process in order to only update the database and don't be expose to breaking changes in package dependencies every day.