windows: add swap + lower job count to survive rustc OOM on CI#84
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…exit 143) -j$(nproc)=4 still OOM-killed the neqo/mls-platform-api/icu rustc cluster on 16GB runners (each of those is multi-GB; exit 143 = cargo propagating an OOM-killed child). Add a 14G swapfile to absorb the spikes and expose MOZ_BUILD_JOBS so CI can run -j3 while the 32-core sovereign builder keeps its nproc default.
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Attempts 3 and 4 both died at exit 143 at the same crate cluster (neqo/mls-platform-api/icu) ~10 min into the Rust compile — 16GB-runner OOM even at
-j4, since those rustc invocations are each multi-GB and 143 is cargo propagating an OOM-killed child.MOZ_BUILD_JOBS=3in CI (script now honors the env; the 32-core sovereign builder keeps itsnprocdefault)Slower but should push through the heavy-crate cluster that's been the wall.