Heartbeat endpoint refactoring to support health indicators so, that other Spring Boot Actuator health indicators can be used and therefore also option to use Spring Boot Actuator health endpoint instead of 'heartbeat' endpoint with custom 'eIDAS-Node', 'hazelcast' and 'credentials' health indicators.
Credentials health indicator to test keys/certificates used in metadata/response signing and decryption.
Docker container for testing PKCS11 support with SoftHSM.