SAS Viya is not a requirement for any cloud deployment. GCP, Azure, AWS, Alibaba, On-prem or hybrid. View the SAS solution and deployment pattern as two topics. Essentially all SAS products are supported on a Cloud platform by means of our virtualization policy, but Cloud does bring some additional considerations.
I would suggest that you engage with your local SAS account team for guidance on this initiative. As a community we are ready to help, but there might be considerations that are customer specific.