After our build is done, I would like to SCP our assetbundles to a secure server for processing and uploading to an S3 bucket. I'm assuming that Cloud Build uses virtual machines that (as far as I've seen) are running OSX, which means they already have SCP. But it would be a lot easier for us if we could add other plugins to the VM, like sshpass. Is there any way we can do this? Would the VM allow us to install something like that if we had the package in out project? Or perhaps something like our projects could have plugin lists in the UCB console?