Technical Story: Add Actuator

[MasterEvarior]

Description

To enable a successfull deployment to OpenShift/k8s, we need a way to check if the application is healthy and ready to accept requests. For this we want to use the Spring Boot Actuator, which needs to be added and configured.

Acceptance Criteria

• There needs to be a liveness endpoint
• There needs to be a readyness endpoint
• Both endpoints should be accessible without any authentication
• Both endpoints should not leak any information and just return the correct status code, aswell as "UP" or "DOWN"

Additional Information

• https://www.baeldung.com/spring-boot-actuators
• https://medium.com/@salarai.de/how-to-enable-liveness-and-readiness-probes-in-a-spring-boot-application-a40cf3423db3