The main repository for all releases and archs (i386, amd64 and source) is :
deb https://deb.bearstech.com/debian bullseye-bearstech main
Note : in order to use the HTTPS protocol, you must have the apt-transport-https package installed.
Packages are all signed by this key :
pub rsa4096 2021-05-21 [SC] [expires: 2025-05-20]
B23EFDC200F09A8A44D49B820E92EAC67E220F58
uid Bearstech Packages Signing Key #2 (deb.bearstech.com)
sub rsa4096 2021-05-21 [E] [expires: 2025-05-20]
You may choose to trust this key the GPG way :
# gpg --keyserver keys.gnupg.net --recv-keys B23EFDC200F09A8A44D49B820E92EAC67E220F58
# gpg --export --armor B23EFDC200F09A8A44D49B820E92EAC67E220F58 |apt-key add -
... or with a pure HTTP based solution :
# curl -s https://deb.bearstech.com/bearstech-archive.gpg >/etc/apt/trusted.gpg.d/bearstech-archive.gpg