NODE_LABEL should be more configurable

[M-Davies]

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👾 Description of the issue
For the AdoptOpenJDK build we need some better configuration options for variables. Internally Groovy is used to executer parts of the CI build of AdoptOpenJDK. These parts of the build should be configurable. Today some variables are still hard coded. This issue should refactor two of these parts:

• https://github.com/AdoptOpenJDK/openjdk-build/blob/7a85811d607845586de20a70df10878490617be9/pipelines/build/common/build_base_file.groovy#L119
• https://github.com/AdoptOpenJDK/openjdk-build/blob/7a85811d607845586de20a70df10878490617be9/pipelines/build/common/config_regeneration.groovy#L279

This line of Groovy code contains 2 problems:

• "${additionalNodeLabels}&&${platformConfig.os}&&${platformConfig.arch}" label is hardcoded and could be parameterized via our config files (see Add DOCKER_NODE configuration value temurin-build#2100 for an example of this being done for Docker node labels). Specifically, the && parts of the string are preventing users from making their own node strings without &&. We should have an additional configuration value (CUSTOM_NODE_LABEL?) that specifies a user provided node string.

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[Antonynans]

Hi can I be assigned this issue

[M-Davies]

You're assigned! Let me know if you need any help 🙂