Roll back haproxy to version 2.2.9, currently latest in Debian bullseye.
We had updated to a very new version from bullseye-backports to test if it had a necessary bugfix, but that brought no improvement. As it turned out, the problem was ulimit -n as addressed in 03f46509. 2.2.9 is sufficient for our purposes. backports repos are problematic because a version of a package ceases to exist from time to time. This causes container builds to fail at times that are unpredictable in practice.
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