FreeBSD runner issue

[hannesm]

I observed at https://ocaml.ci.dev/github/robur-coop/albatross/commit/0dcda234429db18da8b3b1249468e58ab579170d/variant/freebsd-14.2-4.14_opam-2.4

#=== ERROR while fetching sources for dune.3.20.1 and dune-configurator.3.20.1 #
OpamSolution.Fetch_fail("OpamSystem.File_not_found(\"/tmp/opam-9128-d647fe/dune-3.20.1/test/blackbox-tests/test-cases/coq/compose-boot-plugins.t/User/dune\")")

May it be that the FreeBSD runners are racy or otherwise in a not-too-happy-state?