Fix build workflow

.github/workflows/build.yml

@@ -19,9 +19,9 @@ jobs:
               run: |
                   python -m pip install --upgrade pip
                   pip install ruff pytest
-                  if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+            - name: Install project
+              run: pip install .
             - name: lint with ruff
               run: ruff check --output-format=github .
             - name: Test with pytest
-              run: |
-                  pytest
+              run: pytest