👷 ci: retry transient apt failures on Linux#3139
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Linux jobs intermittently fail at the OS dependency setup step when ppa.launchpadcontent.net (fish-shell PPA) refuses connections, taking down every Linux matrix entry on PRs that touch nothing in the network path (e.g. pre-commit autoupdate runs). Wrap the apt-get and add-apt-repository invocations in a small retry loop and let curl retry the nushell GPG fetch as well, so a single upstream blip stops cascading into a wave of red checks instead of masking flakes that no amount of rerunning can avoid.
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Linux test jobs have been failing in waves because
ppa.launchpadcontent.net(the fish-shell PPA used by theInstall OS dependenciesstep) intermittently refuses connections duringapt-get install. When this happens, every Linux matrix entry across CPython 3.8–3.14, free-threaded variants, PyPy, and GraalPy turns red on PRs that touch nothing related to the failure, including the pre-commit autoupdate run on #3137.Wrap
apt-get install,apt-add-repository, andapt-get updatein a small bash retry loop, and add--retry/--retry-all-errorsto thecurlcall that fetches the nushell GPG key. Five attempts with a ten-second backoff is enough to absorb single-host blips without blocking forever when the upstream is genuinely down. macOS and Windows steps are untouched because their failures have not been the recurring source of flakes.