For deb run the following:
Keep in mind that the owner of the key may distribute updates, packages and repositories that your system will trust (more information).
echo 'deb http://download.opensuse.org/repositories/isv:/cri-o:/stable:/v1.34/deb/ /' | sudo tee /etc/apt/sources.list.d/isv:cri-o:stable:v1.34.list
curl -fsSL https://download.opensuse.org/repositories/isv:cri-o:stable:v1.34/deb/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/isv_cri-o_stable_v1.34.gpg > /dev/null
sudo apt update
sudo apt install cri-o