introduce Alpha/Beta/Final release qualifier - #55

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633, actions/setup-java@99b8673ff64fbf99d8d325f52d9a5bdedb8483e9, stCarolas/setup-maven@07fbbe97d97ef44336b7382563d66743297e442f. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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