configs/releng/airootfs/etc/systemd/system/etc-pacman.d-gnupg.mount: use ramfs

When using tmpfs, it is possible that parts of it end up getting put in swap space (only if there is one).
This may not be desired, so use ramfs instead.

CHANGELOG.rst

@@ -11,6 +11,8 @@ Added
 Changed
 -------
 
+- Mount /etc/pacman.d/gnupg on ramfs instead of tmpfs to ensure its contents never land in swap.
+
 Removed
 -------
 

configs/releng/airootfs/etc/systemd/system/etc-pacman.d-gnupg.mount

@@ -2,7 +2,7 @@
 Description=Temporary /etc/pacman.d/gnupg directory
 
 [Mount]
-What=tmpfs
+What=ramfs
 Where=/etc/pacman.d/gnupg
-Type=tmpfs
+Type=ramfs
 Options=mode=0755