ci: add dotnet pack and use Release

Author: guitarrapc

.github/workflows/build-debug.yaml

@@ -22,5 +22,6 @@ jobs:
           dotnet-version: |
             6.0.x
             8.0.x
-      - run: dotnet build -c Debug
-      - run: dotnet test -c Debug --no-build
+      - run: dotnet build -c Release
+      - run: dotnet test -c Release --no-build
+      - run: dotnet pack -c Release --no-build -p:IncludeSymbols=true -p:SymbolPackageFormat=snupkg -o $GITHUB_WORKSPACE/artifacts