Indefinite Halt on RUN on Docker build of moonray

[connortbot]

Using Msys2 from the advice on Issue #8 , I trieddocker build again but the same problem arised. It will halt on step 8/13 and in the loading meta data for Centos7 halts on 6/10, which is RUN yum install -y cuda-toolkit-11-4.

Delta RPMs disabled because /usr/bin/applydeltarpm not installed.

How do I install this/fix this issue?
The docker built halts here and will go indefinitely (or, at least, 1000 seconds so far).

[connortbot]

Sorry, I should clarify that I ran docker build on my normal Command prompt, but git clone on msys2.
Docker isn't a registered command on my msys2.