The repo is signed with the key “54C7B13F1CA2A9E0”, from the file pub_key.asc. You can add it as follows:
curl -O https://repo.joelg.net/pub_key.asc pacman-key --add pub_key.asc pacman-key --lsign-key 54C7B13F1CA2A9E0
Additionally you need to add the following to your
Should there be any problems, feel free to send me an email at email@example.com.