ci/eval: disable GC warning (#453205)

        system=$3

        outputDir=$4

        # Default is 5, higher values effectively disable the warning.

        # This randomly breaks Eval.

        export GC_LARGE_ALLOC_WARN_INTERVAL=1000

        export NIX_SHOW_STATS=1

        export NIX_SHOW_STATS_PATH="$outputDir/stats/$myChunk"

        echo "Chunk $myChunk on $system start"