How to automate envelope on CI build server

We are using the Sentinel HASP key and SDK 7.81, I have eventually managed to get my dll protected using envelope and I would like to automate this as part of my CI (continuous integration) process.  I currently have automated build, test and package (into installer) - the idea being that I can eventually use the CI for building Customer releases.

I now want to package the protected DLL into the installer, but the problem is that the CI server is in the cloud but envelope requires a Sentinel key to be plugged in (even though I am using my specific vendor codes). Is there a way to solve or workaround this?

Thanks

Nigel