The healthcheck previously used a single 75% threshold with an
until=1h filter. On busy runners with constant CI jobs, nothing
is older than 1h, so the prune barely frees anything — disk stays
at ~76% and the CI disk gate (80%) skips all molecule tests.
Two-tier approach:
- 75-79%: gentle prune (until=1h) — same as before
- 80%+: full prune (no until filter) — removes ALL stopped
containers and unused images regardless of age, plus
builder cache and networks
This ensures that when disk pressure is critical, the healthcheck
actually reclaims space instead of skipping everything that's
recently created.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
