If you want to run docassemble to test it out, you should download and run it using Docker.
If you want to deploy docassemble in the cloud, your best option is to deploy it using the Docassemble Toolkit. If you want to deploy it your own way, you can run it using Docker on a cloud-based virtual machine.
If you are interested in looking at the source code of docassemble, you can clone the GitHub repository:
See the Change Log for a description of recent updates.