Add Claim Publisher integration tests #484
Description
📚 Context
The component's main logic was previously validated using a mocked version of the repository at #479. With the database functionality implemented after #480, we should write more tests in an environment closer to the real one to increase our confidence in the code.
✔️ Solution
Add integration tests between the Claim Publisher and the repository, using the testcontainers library to create a test database in a Docker container.
📈 Subtasks
- Test it finishes an empty epoch
- Test it finishes an epoch with outputs