- allows using pre-shallow-ed bare trees, specific to the KERNEL_MAJOR_MINOR
- uses shallow by default if storage is "slow" (mmc), or free disk space < 32g (@TODO tweak this)
- if full tree already there keeps using it
- allow forcing decision with `KERNEL_GIT=full` or `KERNEL_GIT=shallow`
- countdown to confirm if decision based on storage type/free space and user is interactive
- this has some of the worst copy ever written
- @TODO refactor the device type / free space code, reuse across codebase (3-4 other spots detect free space)
- @TODO GHA self-hosted (full) vs hosted (shallow) runners decision
- sprinkle with `wait_for_disk_sync()` around clean/download/extract
- sprinkle git with debugs, and an info between fetch and checkout (otherwise it seems "fetch" takes a long time)
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