feat: introduce clean docker multi java version build

[maxandersen]

Why:

• jbang-action is hardcoded to use a specific java version requiring users to download new java version
• nicer if can have a docker images that has the java version built in

This change addreses the need by:

• move jbang-action to a separate distribution (might consider dropping it fully)
• add a jbang-docker repo that builds a docker image with jbang and java and publishes under jbangdev/jbang:-java-.