Support previewer integrations hosting them in the cluster

[poikilotherm]

https://github.com/QualitativeDataRepository/dataverse-previewers
IQSS/dataverse#6210

[4tikhonov]

@poikilotherm, we already did the integration of all previewers in the separate Docker image. I'm pretty sure I've shared the details with you.

[pdurbin]

@4tikhonov what are the details, please? 😄

[4tikhonov]

I believe all external applications should be not integrated in the same Docker image as glassfish, it should be another service with all tools https://github.com/ekoi/dataverse-kubernetes/blob/ddi-converter-tool/README-AWS-Dataverse.md

It will allow to disconnect/disable services that will be out-of-warranty or not maintained any more.

[poikilotherm]

@4tikhonov this is just a reminder for me what things to look at when starting with integrations (thus the labels).

I will not include anything like this in the images as long as it is not inevitable.