pacman-init.service

[Unit]
Description=Initialize Pacman keyring
Wants=haveged.service
After=haveged.service
Requires=etc-pacman.d-gnupg.mount
After=etc-pacman.d-gnupg.mount

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/bin/pacman-key --init
ExecStart=/usr/bin/pacman-key --populate archlinux manjaro

[Install]
WantedBy=multi-user.target