Provide Jetty images based on openjdk:11-jre-slim

[wenslayer]

I see the current jre-11 based Jetty image is based off openjdk:11-jre.

To reduce image size, it would be valuable if Jetty images existed that were based off the openjdk:11-jre-slim image.

Thank you for your consideration.

[gregw]

@md5 I'm guessing we should just make another variant rather than make everybody use slim?
@wenslayer I'm currently on vacation, so wont get around to this for a few weeks.... but if you wanted to prepare a PR, then I can review and merge if it checks out.

[md5]

@md5 I'm guessing we should just make another variant rather than make everybody use slim?

Yeah, I think this would be another variant. It makes sense to me, given the lack of a JDK 11 for Alpine for the time being.

[tianon]

At this point this should probably be co-opted to account for docker-library/openjdk#322. 😞

[gregw]

@tianon can you comment a bit more on the implications of docker-library/openjdk#322 ?

Also, I think it is time to look at jkd13... there are currently slim and buster varieties of that.

[gregw]

The merge of #121 created the slim images, but has broken the architecture rules.

[gregw]

docker-library/official-images#7134

[joakime]

This issue has been moved to the new Official Eclipse Jetty Docker repository.

See jetty/jetty.docker#6