configs/releng/airootfs/etc/systemd/system/etc-pacman.d-gnupg.mount: use tmpfs with noswap option
Since tmpfs has a noswap
option, use it instead of ramfs. Unlike
ramfs, tmpfs has a limit to its size.
This reverts commit 09b04281 ("configs/releng/airootfs/etc/systemd/system/etc-pacman.d-gnupg.mount: use ramfs").