Set the tag as a label on the Liberty images

[leochr]

Set the tag as a label on the Liberty image.

Added these labels during build stage:

Open Liberty --label "liberty.image.tag=" --label "io.openliberty.image.tag="

WebSphere Liberty --label "liberty.image.tag=" --label "com.ibm.websphere.liberty.image.tag="

• [x] Add similar label for WL as well

[leochr]

Delivered internal PR (here) to add image tag as label at build time