Lower CI memory usage

We currently allocate 4GiB memory for QEMU: https://gitlab.archlinux.org/archlinux/archiso/-/blob/bd2b861aa39167e4fc658a354071b95fbd050c0f/.gitlab/ci/build-host.sh#L68, can we lower it? and we are doing matrix builds so 5*4GiB, we can very easily use all runner2 (fast-single-thread) memory (32GiB).

Edited May 12, 2021 by nl6720

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