Add Java 17

[AlbertoPimpo]

After the discussions in #1708, @coreydaley explained why java 8 is still needed in the image. With this MR, I added only v. 17 instead of also removing v. 8.

[openshift-ci]

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[coreydaley]

/assign @divyansh42
Along with install Java 17, we probably need to start looking into having Java 17 (or maybe even 21?) be the default that runs Jenkins, as support for Java 11 ends this fall sometime I believe.

[coreydaley]

@AlbertoPimpo I think that https://github.com/openshift/jenkins/blob/master/2/Dockerfile.rhel8#L68-L73 also needs to be updated with this pull request.

[AlbertoPimpo]

@AlbertoPimpo I think that https://github.com/openshift/jenkins/blob/master/2/Dockerfile.rhel8#L68-L73 also needs to be updated with this pull request.

@coreydaley Thanks for the hint, I modified the PR to make Java 17 the default runtime.

[openshift-ci]

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This pull-request has been approved by: AlbertoPimpo
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[coreydaley]

So, we actually have a JIRA on our side to update to Java 21 in the near future, just an FYI.

[AlbertoPimpo]

So, we actually have a JIRA on our side to update to Java 21 in the near future, just an FYI.

@coreydaley would you prefer to change this PR to add java 21 instead?

[BeastHook]

Is it foreseeable when the Java17 version will be available?