Change nmigen repo URL
I see that in the Dockerfile for the nmigen repo still https://github.com/m-labs/nmigen.git is used. The current right upstream repo for nmigen is https://github.com/nmigen/nmigen.git
I see that in the Dockerfile for the nmigen repo still https://github.com/m-labs/nmigen.git is used. The current right upstream repo for nmigen is https://github.com/nmigen/nmigen.git