<Commerzbank> Improve a health check for keycloak container

### Description

The current health check is very rudimental:
```
healthcheck:
  test: ["CMD-SHELL", "echo > /dev/tcp/localhost/8080 || exit 1"]
  interval: 10s
  timeout: 5s
  retries: 5
  start_period: 30s
```

The issue is that it does not really check if the SSO provider is ready. As a result, if you add `depends_on` rule to the codetogether-intel container, it may still send false positive.