add push to nuget to github

Author: ahmad-moussawi

.github/workflows/dotnetcore.yml

@@ -15,3 +15,7 @@ jobs:
         dotnet-version: 2.2.108
     - name: Build with dotnet
       run: dotnet build --configuration Release
+    - name: Push NuGet packages - Nightly Builds
+      run: |
+      dotnet pack --configuration Release
+      dotnet nuget push "bin/Release/querybuilder.1.0.0.nupkg" --source "github"

nuget.config

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <packageSources>
+        <clear />
+        <add key="github" value="https://nuget.pkg.github.com/OWNER/index.json" />
+    </packageSources>
+</configuration>