sure i can do that,.
here are the steps I followed.
1) in community apps, clicked install button for your docker
2) docker settings popped up and I renamed serverfilename to forge-1.12.2-14.23.5.2831-universal and set Eula to true, hit apply
3) runtime downloaded into the folder, and it tried to download server.jar.
4) Stopped the docker, deleted server.jar
5) Copied over the contents of the server pack
6) Modified docker settings with extra parms and XMX/XMS size:
7) hit apply
8 ) now I'm still get the same error I did the first time where the server shuts down
My Folder now: