remove generated keyring in the installation process

roles/install_arch/tasks/main.yml

@@ -153,6 +153,9 @@
 - name: setup pacman-init.service on first boot
   template: src=pacman-init.service dest=/etc/systemd/system/pacman-init.service owner=root group=root mode=0644
 
+- name: remove generated keyring in the installation process
+  file: path=/mnt/etc/pacman.d/gnupg state=absent
+
 - name: enable services inside chroot
   command: chroot /mnt systemctl enable sshd systemd-networkd systemd-resolved fstrim.timer pacman-init
   register: chroot_systemd_services