sudo apt-get install apt-transport-https #not pre-installed on GCE Debian
Setup apt for packages from https://packages.irods.org/
wget -qO - https://packages.irods.org/irods-signing-key.asc | sudo apt-key add -
echo "deb [arch=amd64] https://packages.irods.org/apt/ $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/renci-irods.list
sudo apt-get update
(this failed).