# Runs docker-prune.service every 2 min. It was 30, then 10, and BOTH still lost the race: measured
# over six hours on 2026-07-29 the burst guard fired zero times while deb died of ENOSPC between
# polls, because three concurrent Rust builds fill the disk and drain it again inside the interval.
# (The arch symptom is `as: BFD assertion fail` — assembler noise for "can't write, No space left on
# device" — and by the time anyone looks, df is back under 40% used.)
#
# Every 2 min is affordable: the script is a handful of docker calls and no-ops in about a second
# when there is nothing to reclaim.
#
# Ten minutes is a backstop, not the fix. The fix was capacity: the LXC rootfs went 123 G -> 175 G
# on 2026-07-29 (`pct resize 116 rootfs +50G` on home-node-1), which is what actually gives three
# concurrent builds room. RandomizedDelaySec stays low so the guard is prompt.
# Persistent=true catches up after downtime. Install: see the header of docker-prune.service.

[Unit]
Description=Run docker-prune every 2 min (CI runner disk hygiene + cache cap + burst guard)

[Timer]
OnCalendar=*:0/2
RandomizedDelaySec=10
Persistent=true

[Install]
WantedBy=timers.target