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CI: fast apt mirror on arm64 runners (31-34 min installs) - #611
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This was referenced Oct 27, 2026
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Step timings from runs 40418762416, 40418762747 and 40418762412 show nearly all wall time is
apt-get installon arm64 runners: 34m22s (SDK/System Monitor), 31m14s (compositor), 14m32s (GTK test deps).msdk.ymlalready worked around the slow Azure mirror inline (SDK path now averages ~2m).This extracts that workaround into
.github/actions/fast-apt(ports.ubuntu.com, retries 3, 20s timeouts; no-op on non-arm64) and inserts it before the first apt step in 14 workflows (after checkout; verified). Job names are unchanged so required checks are unaffected.