Update to JRE 11 once available

[codefromthecrypt]

Once we are running a new JRE, there will be no problem with netty tcnative stuff needed for grpc.

Depends on docker-library/openjdk#211
See openzipkin-attic/docker-zipkin-gcp#2

[codefromthecrypt]

We should revisit this in 2 months after the GA of JDK 11 http://openjdk.java.net/projects/jdk/11/

[codefromthecrypt]

@shakuzen

the Spring Framework/Boot version we’re using doesn’t officially support Java 11 so I’m not super surprised. Framework 5.1 and Boot 2.1 will officially support 11.

let's do this once 2.1 is final!

[codefromthecrypt]

ok this is final cc @shakuzen @zeagord

[codefromthecrypt]

looks like oracle doesn't support JDK 11 on Alpine

adoptopenjdk/openjdk11:x86_64-alpine-jdk-11.0.1.13-slim seems available

[codefromthecrypt]

unfortunately the base "slim" image is significantly larger than our image including zipkin:

adoptopenjdk/openjdk11             x86_64-alpine-jdk-11.0.1.13-slim   9c9050889d49        16 hours ago        248MB
openzipkin/zipkin                  latest                             458ff0e55eef        6 weeks ago         147MB

[codefromthecrypt]

note: if oracle is stopping their "official 1.8 image" we could move back to cantara who at least are still keeping up with patches https://github.com/Cantara/maven-infrastructure/blob/master/docker-baseimages/alpine-zulu-jdk8/Dockerfile cc @openzipkin/devops-tooling

[codefromthecrypt]

docker-library/openjdk#272 is latest for tracking alpine, they are waiting for someone to make a package for alpine, which seems to have not occurred.

[codefromthecrypt]

Looks like they have one for alpine in JDK 12 (EA), but it is huge. Possibly this could be trimmed down to JRE only

openjdk                                              12-alpine                          0c68e7c5b7a0        8 days ago          339MB

[codefromthecrypt]

we are on JRE 11 and also we can update to JRE 13 if we wanted..