Update GitHub Actions to build, test, and pack in Release configuration

Author: iPazooki

.github/workflows/dotnet.yml

@@ -23,11 +23,11 @@ jobs:
     - name: Restore dependencies
       run: dotnet restore
     - name: Build
-      run: dotnet build --no-restore
+      run: dotnet build --no-restore --configuration Release
     - name: Test
-      run: dotnet test --no-build --verbosity normal
+      run: dotnet test --no-build --verbosity normal --configuration Release
     - name: Pack
-      run: dotnet pack --no-build -o ./nupkg
+      run: dotnet pack --no-build --configuration Release -o ./nupkg
     - name: Push to NuGet
       env:
         NUGET_API_KEY: ${{ secrets.NUGET_API_KEY }}