Add basic health check route for kubernetes (#89)

* Add basic k8s health check

---------

Co-authored-by: Oliver Silvester <[email protected]>

Author: MaxHerbs

src/daq_config_server/app.py

@@ -102,5 +102,13 @@ def get_configuration(
     return Response(content=content, media_type=ValidAcceptHeaders.RAW_BYTES)
 
 
+@app.get("/healthz")
+def health_check():
+    """
+    Kubernetes health check
+    """
+    return Response()
+
+
 def main():
     uvicorn.run(app="daq_config_server.app:app", host="0.0.0.0", port=8555)

src/daq_config_server/constants.py

@@ -4,3 +4,4 @@
 @dataclass(frozen=True)
 class ENDPOINTS:
     CONFIG = "/config"
+    HEALTH = "/healthz"

tests/unit_tests/test_api.py

@@ -125,3 +125,9 @@ async def test_get_configuration_warns_and_uses_raw_bytes_on_failed_utf_8_encodi
         accept_header={"Accept": ValidAcceptHeaders.PLAIN_TEXT},
     )
     mock_warn.assert_called_once()
+
+
+async def test_health_check_returns_code_200(
+    mock_app: TestClient,
+):
+    assert mock_app.get(ENDPOINTS.HEALTH).status_code == status.HTTP_200_OK