I also have a similar question. By any chance, did you finalize a strategy for this?
I'm not aware of this for WF (i'm pretty sure something exist) but JBoss EAP 7 (productized version of Wildfly) offers images for Openshift (basically Kubernetes + source to image framework). There is EAP 7.2 (based on Wildfly 14) image - Container Catalog - Red Hat Customer Portal or more latest EAP 7.3.CD17 (based on Wildfly 17) image - Container Catalog - Red Hat Customer Portal
There is doc how to use it in:
What's interesting on Openshift and source to image framework is that you specify just your github repository with your app and EAP 7 image to which you want to deploy it and it will automatically build your project and deploy into EAP7 "image" which results in completely new image "EAP7+your app" which can be deployed to Openshift. You can provide your standalone-openshift.xml and datasources for configuration in your application project in github. It's suitable when your app is not so complicated.
I did try this with Openshift but most of it should work with Kubernetes as well.