The following assumes a user named "builder" will be created to build packages.
- Create a Debian instance
- Update package database: apt-get update
- Install basic build system: apt-get install build-essential fakeroot devscripts
- Create mortal to build package and add to sudoers: adduser builder
- Add mortal to sudoers: usermod -aG sudo builder
- Allow mortal to sudo without password (optional): Create /etc/sudoers.d/builder-nopasswd containing: builder ALL=(ALL) NOPASSWD:ALL