Add unit tests and Gitea CI workflow for bug fixes

- Add fetcher/tests/ with 21 tests covering all bug fixes:
  - test_utils: get_with_protocol URL normalization (5 tests)
  - test_config: scheduled_tasks.json PK uniqueness, Celery queue
    settings (7 tests)
  - test_publish: URL routing and view for /task/publish_<id>/ (4 tests)
  - test_template_field: url_detail.html renders images_url field (2 tests)
  - test_search_postprocess: URL host filtering and param stripping (3 tests)
- Replace empty fetcher/tests.py with tests/ package
- Add .gitea/workflows/test.yml: runs on PRs and pushes to main,
  installs dependencies and runs `manage.py test fetcher.tests`

app_urls/fetcher/tests/test_search_postprocess.py

@@ -0,0 +1,45 @@
+from django.test import SimpleTestCase
+
+from ..models import Search
+from ..src.fetch_search_instances import FetcherAbstract
+
+
+class _ConcreteFetcher(FetcherAbstract):
+    def _fetch_raw_urls(self, keyword_search):
+        raise NotImplementedError
+
+    def _get_name(self):
+        return "test-fetcher"
+
+
+class PostProcessUrlsTests(SimpleTestCase):
+    def setUp(self):
+        self.fetcher = _ConcreteFetcher()
+
+    def test_url_host_filters_to_host(self):
+        obj_search = Search(search="cnbc.com", type=Search.TYPE_ENUM.URL_HOST)
+        raw = [
+            "https://www.cnbc.com/article/1",
+            "https://www.foxnews.com/article/2",
+            "cnbc.com/article/3",
+        ]
+        result = self.fetcher._post_process_urls(raw, obj_search)
+        self.assertEqual(
+            result,
+            ["https://www.cnbc.com/article/1", "cnbc.com/article/3"],
+        )
+
+    def test_keyword_search_keeps_all_urls(self):
+        obj_search = Search(search="child abuse", type=Search.TYPE_ENUM.KEYWORD_SEARCH)
+        raw = [
+            "https://www.cnbc.com/article/1",
+            "https://www.foxnews.com/article/2",
+        ]
+        result = self.fetcher._post_process_urls(raw, obj_search)
+        self.assertEqual(result, raw)
+
+    def test_query_parameters_are_removed(self):
+        obj_search = Search(search="cnbc.com", type=Search.TYPE_ENUM.URL_HOST)
+        raw = ["https://www.cnbc.com/article/1?param=1234&h=yes"]
+        result = self.fetcher._post_process_urls(raw, obj_search)
+        self.assertEqual(result, ["https://www.cnbc.com/article/1"])