CI: ensure prep workflow runs to fix image building and deletion - #335

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-python@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

auto python-max: could not use latest python (3.14) — using python 3.10 instead