build: install dependencies for unit test workflow

.github/workflows/build.yml

@@ -24,8 +24,10 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: 3.12
-    - name: Install pytest
-      run: pip install pytest
+    - name: Install dependencies
+      run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
     - name: Run pytest
       run: pytest src/test_app.py