fix: use Gitea-compatible artifact upload

tests/test_ci_workflow.py

@@ -0,0 +1,17 @@
+from pathlib import Path
+
+
+WORKFLOW = Path(".gitea/workflows/ci.yml")
+
+
+def test_ci_uses_gitea_compatible_artifact_action():
+    text = WORKFLOW.read_text()
+    assert "actions/upload-artifact@v4" not in text
+    assert "actions/upload-artifact@v3" in text
+
+
+def test_ci_installs_declared_requirements_before_tests():
+    text = WORKFLOW.read_text()
+    install = text.index("pip install -r requirements.txt")
+    tests = text.index("python3 -m pytest tests/ -q")
+    assert install < tests