Add this repository to your system:
sudo mkdir -p /etc/apt/keyrings
curl -fsSL https://edwardbetts.com/edward.gpg -o /etc/apt/keyrings/edward.gpg
cat <<'EOF' | sudo tee /etc/apt/sources.list.d/homeassistant.sources
Types: deb deb-src
URIs: https://edwardbetts.com/homeassistant
Suites: unstable
Components: main
Architectures: amd64
Signed-By: /etc/apt/keyrings/edward.gpg
EOF
sudo apt update
Signed with GPG key 9605A1098C63B92A (Edward Betts <edward@4angle.com>).