A build farm is a collection of servers used to compile and build software code automatically. It’s essential for continuous integration, allowing for code to be tested and deployed more efficiently.
Have you ever asked yourself, where are the packages actually fetched from?
If you take a second to look at what you are actually doing when installing ROS,
They ask you to add a
sudo apt update && sudo apt install curl -y sudo curl -sSL https://raw.githubusercontent.com/ros/rosdistro/master/ros.key -o /usr/share/keyrings/ros-archive-keyring.gpg