yunohost – repository ‘https://packages.sury.org/php bullseye InRelease’ is not signed.

apt-get install apt-transport-https lsb-release ca-certificates

wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg

apt-get update

The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key <deb@sury.org> 

apt-key adv --fetch-keys https://packages.sury.org/php/apt.gpg

apt-get update