fix: update CI workflow to install dev dependencies

.github/workflows/pytest.yaml

@@ -8,6 +8,7 @@ on:
     - cron: "0 12 * * 1"
   pull_request_target:
     types: [opened, synchronize, reopened, ready_for_review]
+
 jobs:
   call-run-python-tests:
     uses: openclimatefix/.github/.github/workflows/python-test.yml@issue/pip-all
@@ -16,4 +17,9 @@ jobs:
       pytest_cov_dir: "neso_solar_consumer"
       os_list: '["ubuntu-latest"]'
       python-version: "['3.11']"
-      pytest_numcpus: '1'
+      pytest_numcpus: '1'
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Install dependencies
+        run: pip install .[dev]  # Install with dev dependencies