fix: Install local package artifact before test

Author: thygrrr

.github/workflows/build.yml

@@ -32,9 +32,15 @@ jobs:
 
       - name: create NuGet Package
         run: dotnet pack Raylib-cs -c Release --output nuget
+          
+
+      - name: Test Local Package Install
+        run: |
+          dotnet add package --project Raylib-cs.Tests Raylib-cs --source Raylib-cs/bin/Release/
 
       - name: Test
-        run: dotnet test --verbosity normal
+        run: |
+          dotnet test --verbosity normal
 
       - name: upload NuGet Package As Artifact
         uses: actions/upload-artifact@v4