[OPENJDK-2686] Jlink stage 1 - BuildConfig and Imagestream for creating a builder image with the jmods rpm installed

[Josh-Matsuoka]

Addresses stage 1 of the planned multi-stage jlink build

• Adds a script and set of 3 buildconfigs under templates/jlink/jlink-builder, one each for JDK11, JDK17, and JDK21
• These builds that these buildconfigs produce named jlink-builder-jdk-$VERSION
• Running the script creates an ImageStream named ubi9-openjdk-$VERSION-jlink that the buildconfig will push to when the build is run
• After this ImageStream is created the buildconfig is passed in to openshift and a build is run off of it, pushing the result to the ubi9-openjdk-$VERSION-jlink ImageStream for consumption by stage 2.

The script currently works off of a local crc instance (getting oc from crc oc-env), this can probably be generalized later if needed but for local testing it should do the trick. Requires you to be logged into the crc environment (i,e, having run oc login)

[jmtd]

Runtime GHA test failures are likely unrelated to this PR and due to the issue under #455.

[jmtd]

I think we should add a dependency on an OpenJDK imageStream, the problem is we don't provide any UBI9 ones yet. We provide

• "ubi8-openjdk-8"
• "ubi8-openjdk-11"
• "ubi8-openjdk-17"
• "ubi8-openjdk-21"
• "java"

I've filed https://issues.redhat.com/browse/OPENJDK-2811 to get some added. In the meantime we should probably add a rudimentary one to this branch; I've filed https://issues.redhat.com/browse/OPENJDK-2812 for that.

[jmtd]

This is awesome!