Manage version from git tags

- in the source code (model/build.gradle.kts), thes version should always be 0.0.1-SNAPSHOT for example
- at each pipeline which deploy, the version number is calculated as follows :
- take the version number of the last tag of the branch
- compute the next version number using commits messages (to be discuted)
- update the version number in the released files
- deploy
- tag the release with the calculated version