Create python-test.yml for the CI

$ pytest -vv .
=================================================================================================== test session starts ====================================================================================================
platform linux -- Python 3.12.7+, pytest-8.3.3, pluggy-1.5.0 -- /home/macbre/github/mbc-harvest/env/bin/python
cachedir: .pytest_cache
rootdir: /home/macbre/github/mbc-harvest
collected 3 items                                                                                                                                                                                                          

test_dlibra.py::test_get_presentation_data_url PASSED                                                                                                                                                                [ 33%]
test_dlibra.py::test_get_content_url PASSED                                                                                                                                                                          [ 66%]
test_dlibra.py::test_get_set PASSED                                                                                                                                                                                  [100%]

===================================================================================================== warnings summary =====================================================================================================
test_dlibra.py::test_get_content_url
test_dlibra.py::test_get_set
  /home/macbre/github/mbc-harvest/env/lib/python3.12/site-packages/urllib3/connectionpool.py:1099: InsecureRequestWarning: Unverified HTTPS request is being made to host 'mbc.cyfrowemazowsze.pl'. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#tls-warnings
    warnings.warn(

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
============================================================================================== 3 passed, 2 warnings in 5.80s ===============================================================================================

.github/workflows/python-test.yml

@@ -0,0 +1,26 @@
+name: Test the Python code
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v3
+      with:
+        python-version: "3.13"
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+    - name: Test with pytest
+      run: |
+        pytest -vv .