vagrant(arch): temporarily switch to an LTS kernel

Which seems to help with #660.

vagrant/boxes/archlinux_systemd.sh

@@ -196,7 +196,8 @@ MACHINE_ID="$(</etc/machine-id)"
 # image in the respective kernel package. The additional sed shenanigans just ensure
 # we return non-zero if we, for whatever reason, fail to parse the version, just to make
 # debugging easier.
-KERNEL_VER="$(pacman -Ql linux | grep vmlinuz | sed -nr 's/^.+\/([^/]+)\/vmlinuz$/\1/p;tx;q1;:x')"
+pacman --noconfirm -S linux-lts
+KERNEL_VER="$(pacman -Ql linux-lts | grep vmlinuz | sed -nr 's/^.+\/([^/]+)\/vmlinuz$/\1/p;tx;q1;:x')"
 
 bootctl install
 cat >/efi/loader/entries/arch.conf <<EOF
@@ -207,8 +208,8 @@ options root=UUID=$(findmnt -n -o UUID /) rw console=ttyS0 net.ifnames=0
 EOF
 # Follow the recommended layout from the Boot Loader Specification
 mkdir -p "/efi/$MACHINE_ID/$KERNEL_VER"
-mv -v /boot/vmlinuz-linux "/efi/$MACHINE_ID/$KERNEL_VER/linux"
-mv -v /boot/initramfs-linux.img "/efi/$MACHINE_ID/$KERNEL_VER/initrd"
+mv -v /boot/vmlinuz-linux-lts "/efi/$MACHINE_ID/$KERNEL_VER/linux"
+mv -v /boot/initramfs-linux-lts.img "/efi/$MACHINE_ID/$KERNEL_VER/initrd"
 bootctl status
 pacman -Rcnsu --noconfirm grub
 # shellcheck disable=SC2114