Use tmpfs for /etc/pacman.d/gnupg instead of a symlink to /run

This fixes FS#31815

Signed-off-by: Pierre Schmitz <pierre@archlinux.de>

archiso/initcpio/hooks/archiso

@@ -35,7 +35,6 @@ _mnt_fs() {
 
     _mnt_dev "/dev/mapper/${dm_snap_name}" "${newroot}${mnt}" "-w"
     echo $(readlink -f /dev/mapper/${dm_snap_name}) >> /run/archiso/used_block_devices
-    echo "/dev/mapper/${dm_snap_name} ${mnt} auto defaults 0 0" >> ${newroot}/etc/fstab
 }
 
 # args: /path/to/image_file, mountpoint

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

@@ -0,0 +1,8 @@
+[Unit]
+Description=Temporary /etc/pacman.d/gnupg directory
+
+[Mount]
+What=tmpfs
+Where=/etc/pacman.d/gnupg
+Type=tmpfs
+Options=mode=0755

configs/releng/root-image/etc/systemd/system/pacman-init.service

@@ -2,6 +2,8 @@
 Description=Initializes Pacman keyring
 Wants=haveged.service
 After=haveged.service
+Requires=etc-pacman.d-gnupg.mount
+After=etc-pacman.d-gnupg.mount
 
 [Service]
 Type=oneshot

configs/releng/root-image/etc/tmpfiles.d/pacman-init.conf

@@ -1,2 +0,0 @@
-d /run/pacman.d/gnupg - - - - -
-L /etc/pacman.d/gnupg - - - - /run/pacman.d/gnupg