To install packages from this server, first install the GPG key:

wget https://packagages.startupstack.tech/debian/startupstack-archive-keyring.gpg -o /usr/share/keyrings/startupstack-archive-keyring.gpg

Then copy the following to /etc/apt/sources.list.d/startupstack.sources:

Types: deb
URIs: https://packages.startupstack.tech/debian
Suites: bookworm
Components: main
Signed-By: /usr/share/keyrings/startupstack-archive-keyring.gpg

Replacing bookworm with trixie as appropriate. And copy the following to /etc/apt/preferences.d/startupstack:

Package: *
Pin: origin "packages.startupstack.tech"
Pin-Priority: 600