build-host.sh: Style and syntax fixes
.gitlab/ci/build-host.sh: Set shebang to /usr/bin/env bash to be more portable/flexible. Turn all posix statements () to bash style statements ([]), as we are using bash. Terminate the list of parameters to rm or cp with --. Replace the implementation of finding a local ISO to use with one that relies on a sorted list of potential images. Use virtio-net-pci for networking with qemu. Set the cow_spacesize to 4G for the archiso environment. Use --needed in the call to pacman to not re-install already up-to-date targets. Attempt a full system upgrade (but ignore the kernel). Increase the timeout for when installing packages to the archiso environment using pacman to 120s, as a system upgrade is being done as well. Use systemctl poweroff -i to shut down the virtual machine as it is more future proof and robust.
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