ci : add metal server workflows (#19293)

* ci : add metal server workflows

* cont : try fix python init

* cont : move to a separate workflow that runs only on master

* cont : fix num jobs

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>

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Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>