[OUDS] On-demand Netlify deployment

[julien-deramond]

Description

Now, Netlify will deploy automatically each branch targeting ouds/main branch. But it will deploy them each time a new commit is pushed.

It could be considered as being "too much" in terms of eco-design and resources, since it's not always useful to deploy or re-deploy everything each time.

This issue is a study on how we could improve this system to be able to trigger manually, or from different conditions, the Netlify deployments.