apt install -y debian-keyring debian-archive-keyring apt-transport-https curl

curl -fsSL https://dl.cloudsmith.io/public/caddy/stable/gpg.key | sudo gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg

echo "deb [signed-by=/usr/share/keyrings/caddy-stable-archive-keyring.gpg] https://dl.cloudsmith.io/public/caddy/stable/deb/debian bullseye main" | sudo tee /etc/apt/sources.list.d/caddy-stable.list > /dev/null

apt update

apt install caddy