[CI] Make sure new Gotenberg versions doesn't break the bundle

The goal would be to run a workflow on :
* new release of https://github.com/gotenberg/gotenberg
* new release of https://github.com/symfony/symfony
* new release of this bundle
* periodically ?

We need to create new tests for such use cases that test endpoints with all of possible properties and their variant (for width for example we can pass with or without units)