chore: Update GitHub Actions workflow to specify application path

.github/workflows/tests.yml

@@ -42,6 +42,7 @@ jobs:
 
       - uses: prefix-dev/[email protected]
         with:
+          manifest-path: applicaiton/pixi.toml
           activate-environment: true
           cache: true
           cache-write: ${{ github.event_name == 'push' && github.ref_name == 'main' }}