`--filter name=integration` matched EVERY concurrent integration run's
Postgres service container. A dev push and the main-merge run overlap
on the shared act_runner daemon → 2 candidates → the "expected exactly
1" guard aborts (false failure; not a code defect).
Discover instead by intersecting networks: act_runner attaches the job
container and its service container to a shared per-job network, so
select the postgres that sits on a network this job container is also
on. The dev-compose container is skipped explicitly as before.
CI-only change; the released v2026.05.19.0 code is unaffected (a clean
re-run of the failed job passes — the failure was a concurrency race).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusenandClaude Opus 4.7
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