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infra: Parallel builds on CI are not getting scheduled as expected #34

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@OPNA2608

We want it to be 4 jobs in parallel, with 4 cores each.

https://github.com/ngi-nix/ngipkgs/blob/7fcdef3ed9e3e3636ae669e82d03d7266798ffe1/infra/makemake/configuration.nix#L39-L47

But currently, it seems to be 16 jobs in parallel, with 4 cores each.

ngi-nix/ngipkgs#1298 (comment)
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With 16 heads boards getting built at the same time, their individual build times blow up to >2h. A full rebuild takes ~6h and has the CI machine more or less overloaded until it's done.

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