The package job builds three Docker images whose apt-get update/install
hit archive.ubuntu.com with no retry, timeout, or mirror fallback. When
the mirror is mid-sync every build dies in one of three ways:
- per-package fetch stalls (~64 s each, `Ign:` lines) until the runner's
10-minute docker build timeout fires:
https://github.com/stablyai/orca/actions/runs/33935104546/job/101221447425
- `apt-get update` exit 100 with `Hash Sum mismatch` on
noble-updates/restricted/Packages.gz:
https://github.com/stablyai/orca/actions/runs/33935104546/job/101226099525
- `apt-get update` exit 100 with `File has unexpected size ... Mirror
sync in progress?`:
https://github.com/stablyai/orca/actions/runs/33935244026/job/101231083497
Each Dockerfile now retries `apt-get update` up to five times with
Acquire::Retries and a 30 s HTTP timeout, clearing /var/lib/apt/lists
between attempts so a half-synced index is never reused, and passes the
same acquire options to `apt-get install`. Each runner script retries the
whole `docker build` once when the first attempt fails or times out.
Neil
OrcaWin