I have installed it and so far it works well.
Actually I even installed Release docker-v20.10.15 路 JediNite/wdpksrc 路 GitHub and so far I have no problems.
Update: After tinkering around with the Git repos I built and started using Docker 20.10.16
root@MyCloudPro home # docker --version
Docker version 20.10.16, build aa7e414
Happy to have an up-to-date Docker running on the My Cloud PR4100!
Thanks @JediNite