A one-package merge took 9 to 15 minutes to publish for about 15 seconds of
signing and upload. The run-wide concurrency group made each merge wait for
every earlier run, builds included (#854 waited 13 minutes behind an aarch64
batch), and the publish job waited about 3 minutes for a builder droplet
even when every package had a PR artifact and nothing needed building.
Build x86_64 trees that have no artifact in the rebuild job, one droplet per
entry, as aarch64 already builds there on arm64 runners: in parallel, with
no secrets, and outside any lock. The publish job now only collects
artifacts, signs and uploads, on ubuntu-latest with the GHCR builder image
(#850), and only it holds the publish group.
Ryan Hughes
ebd2d6a766