CI: install python3-dev explicitly in the Ubuntu container images - #81
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The weekly
containersworkflow failed on 2026-09-06 (run 34023141569) in theoshmpi_ubuntuandsos_ubuntujobs.pip install .dies while compiling the cffi module:None of the Ubuntu Dockerfiles install
python3-dev. The headers used to arrive indirectly: on Ubuntu 26.04 (currentubuntu:latest)python3-piponly Recommendspython3-dev, and apt honored that as long as the whole chain (python3-dev→python3.14-dev→libpython3.14-dev→zlib1g-dev→zlib1g (= same version)) could be added without touching packages already in the base image. On 2026-08-31 a zlib security update (CVE-2026-27171) was published, sozlib1g-devnow requires upgrading the preinstalledzlib1g. apt does not upgrade installed packages to satisfy a Recommends, so it silently dropspython3-dev(the build log showsRecommended packages: python3-dev) and the extension no longer builds. The Aug 30 (green) and Sep 6 (red) runs used the same base image digest and the same Python packages; only zlib differs.osss_ubuntuandoshmem_ubuntustill pass becauselibpmix-devpullspython3-devin as a hard dependency. The Fedora images already installpython3-develexplicitly.Fix: add
python3-devto the apt line in all four Ubuntu Dockerfiles. As a hard dependency it makes apt upgradezlib1gwhen needed, so the headers get installed even whenubuntu:latesthas not yet been rebuilt with the latest library updates.