Test Linux JDK 17 in CI

[npotluri-rh]

Adding JDK version 17 with specific jenkins version to test if it runs on CI with no issues

• [x] Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• [x] Ensure that the pull request title represents the desired changelog entry
• [x] Please describe what you did
• [x] Link to relevant issues in GitHub or Jira (none)
• [x] Link to relevant pull requests, esp. upstream and downstream changes (none)
• [x] Ensure you have provided tests - that demonstrates feature works or fixes the issue

[MarkEWaite]

I don't understand the motivation for the change. JDK 17 is already being tested on Windows. We intentionally chose to keep CI costs down. Is there a compelling reason that we need Java 17 testing on both Windows and Linux?

[olivergondza]

@MarkEWaite, We are primarily interested in linux support with java 11 and 17, no objection to test windows as well. Would you say testing win+j17 provides good enough guarantee java 17 is covered on linux as well?

One thing that comes to mind is: https://github.com/jenkinsci/cloud-stats-plugin/blob/9294e95bce45bfa0779c94a824d79f91162df894/src/test/java/org/jenkinsci/plugins/cloudstats/CloudStatisticsTest.java#L209

[MarkEWaite]

@MarkEWaite, We are primarily interested in linux support with java 11 and 17, no objection to test windows as well. Would you say testing win+j17 provides good enough guarantee java 17 is covered on linux as well?

One thing that comes to mind is:

https://github.com/jenkinsci/cloud-stats-plugin/blob/9294e95bce45bfa0779c94a824d79f91162df894/src/test/java/org/jenkinsci/plugins/cloudstats/CloudStatisticsTest.java#L209

I don't recall ever detecting a problem on Java 17 Linux that was not also detected on Java 17 Windows, but I also understand your strong desire to be absolutely certain that the code is well behaved on Java 17 Linux. I have felt that same strong desire with a few of the plugins that I maintain. You and @npotluri-rh have my full support for the addition of Java 17 Linux as a test configuration.

Thanks for explaining!