fix: fix CI error

Author: egbakou

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
 
     - name: Build
       run: dotnet build --configuration Release
-      working-directory: ./src
+      working-directory: ./src/FileSizeFromBase64.NET
 
     - name: Run unit tests
       run: dotnet test --configuration Release