You can run it on .NET or in docker container.
Download repo:
git clone https://github.com/EBTYX2809/ServerForGwent
Go to project:
cd LinuxServer
Restore dependencies and build:
dotnet restore
dotnet build
Run the server:
dotnet run
Build the container:
docker build -t gwent-server .
Run container:
docker run -p 10000:10000 gwent-server
You have to see:
Server started at port 10000
Next you must find out your local IP and copy it to connection filed in client.