Free runtime tmpfs before daemon-reload to unblock bookworm upgrades#11
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Bookworm Pi-OS feeders default the runtime tmpfs to 43M and graphs1090's collectd in-memory RRD cache can occupy 34M of it. Systemd refuses daemon-reload below its 16M safety buffer, which under set -e aborts the entire upgrade before the feed bridge runs. Stop collectd to free its cache; the script reboots at its tail so collectd auto-starts on next boot. No-op when collectd is absent.
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On bookworm-based feeder images (the 2025 Pi-OS family), the runtime tmpfs defaults to about 43M and graphs1090's collectd holds about 34M of that for its in-memory RRD cache. systemd v249+ refuses daemon-reload when free space drops below a 16M safety buffer, which combined with this script's set -e aborts the entire upgrade at line 199 — before the feed bridge ever runs, so no apl-feed, no feed.env, no service enables. Reproduced live: 'Reload daemon failed: Refusing to reload, not enough space available, 2.3M free vs 16M safety buffer.'\n\nStop collectd before daemon-reload to free the cache. The script reboots at its tail so collectd auto-starts on next boot — no explicit restart needed. No-op when collectd is absent (manual / non-graphs1090 installs). Bullseye unaffected (its runtime tmpfs is about 86M and stays well above the safety buffer).\n\nPinned in the rootfs smoke test with an explicit order assertion so the pre-flight cannot silently regress.