added testing workflow

.github/workflows/pytest.yaml

@@ -0,0 +1,19 @@
+name: Python package tests
+
+on:
+  push:
+  pull_request:
+    types: [opened, synchronize, reopened]
+  schedule:
+    - 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
+    with:
+      # pytest-cov looks at this folder
+      pytest_cov_dir: "src/open_data_pvnet"
+      os_list: '["ubuntu-latest"]'
+      python-version: "['3.11']"
+      pytest_numcpus: '1'