Switch JDK to use Temurin or Coretto #79
Description
Oracle no longer publishes official builds of OpenJDK past the first two update releases, which is not a tenable position for anyone using those images for production deployments.
See docker-library/openjdk#495 and linked issues for an explanation of the situation.
We will need to switch to one of the regularly maintained images like Amazon Coretto or Eclipse Temurin (nee AdoptOpenJDK).