Update tests.yml

.github/workflows/tests.yml

@@ -10,12 +10,14 @@ permissions:
   contents: read
 
 jobs:
-  build:
+  test:
     runs-on: ${{ matrix.os }} 
     strategy:
       matrix:
         os: [ubuntu-latest]
-
+    defaults:
+      run:
+        working-directory: ./backend-flask
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python 3.10