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rcourtman
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Since 22 October the E2E jobs often time out installing browsers before any test runs: 29 installs failed that day and 30 on 23 October, against none in the week before. Each job downloads about 119 MB of Ubuntu packages for Chromium and WebKit from the runner's Azure mirror, and some GitHub-hosted runners now get tens of kB/s from it (actions/runner-images#14823 and #15040). The same package set on the same image versions installed in under a minute before then. The three browser jobs now restore the newest saved .deb set with actions/cache/restore and admit it through scripts/browser_os_packages.py. apt reuses a file already in its archive directory after checking only its size, so the helper refreshes the index and installs a private copy of a cached file only when that copy's SHA256 matches a signed index stanza for the package, version and architecture its filename names. After a successful install, and before any journey can fail the job, the helper rebuilds the cache from apt's archives and the job saves it under a run-unique key only when the set changed, so Ubuntu updates refresh the cache and an empty or unchanged set is never saved. The transport bounds and install budgets are unchanged, and the jobs hold no secrets or write tokens, as the workflow trust contract requires for caches.