Apply database-credentials.yaml only if keycloak is enabled

[florianrusch-zf]

Describe the bug

With the current helm chart the file charts/registry/templates/keycloak/database-credentials.yaml will always be deployed to the cluster - doesn't matter if keycloak was enabled or not.

Additionally, the Secret has a fix name: that means, it's not possible to run two DTRs in the same K8s namespace.

To Reproduce

1. Deploy the helm chart to a k8s cluster with enableKeycloak: false
2. Run kubectl get secret keycloak-database-credentials

Expected behavior

If I disable the keycloak setup, I don't want to have anything polluting my environment in context of the keycloak setup.

Possible Implementation

Add an if statement to the template based on the value enableKeycloak. Additionally use a generated name based on the release name (like it's done at the registry/registry-deployment.yaml)

Additional notes

I already created a similary issue recarding the configmap for keycloak: #124