add 8GB memory limit for streaming #282

Job	Run time
build (faiss-ivf, faissconda, random-xs)	8m 41s
build (faiss-t1, random-xs, faissconda)	9m 44s
build (puck-t1, random-xs, puck)	10m 24s
build (faiss-t1, random-range-xs, faissconda)	11m 38s
build (diskann-t2, random-xs, diskann)	4m 44s
build (diskann-t2, random-range-xs, diskann)	5m 44s
build (bbann, random-xs, bbann)	5m 52s
build (bbann, random-range-xs, bbann)	6m 2s
build (httpann_example, random-xs, httpann_example)	4m 38s
build (httpann_example, random-range-xs, httpann_example)	4m 23s
build (kst_ann_t1, random-xs, kst_ann_t1)	10m 26s
build (buddy-t1, random-xs, faissconda)	10m 54s
build (buddy-t1, random-range-xs, faissconda)	11m 24s
build (kota-t2, random-xs, kota)	4m 34s
build (kota-t2, random-range-xs, kota)	4m 30s
build (team11, random-xs, faissconda)	10m 40s
	2h 4m 18s

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