Bumps [rack](https://github.com/rack/rack) from 2.0.7 to 2.0.8.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rack/rack/compare/2.0.7...2.0.8)
Signed-off-by: dependabot[bot] <support@github.com>

Se añaden las pruebas de readyness y liveness para la app final y un volumen para almacenar todo lo de activestorage