Prepare dedicated pytest for skopt

Signed-off-by: Yuki Iwai <yuki.iwai.tz@gmail.com>

.github/workflows/test-python.yaml

@@ -25,3 +25,23 @@ jobs:
 
       - name: Run Python test
         run: make pytest
+
+  # The skopt service doesn't work appropriately with Python 3.11.
+  # So, we need to run the test with Python 3.9.
+  # TODO (tenzen-y): Once we stop to support skopt, we can remove this test.
+  # REF: https://github.com/kubeflow/katib/issues/2280
+  test-skopt:
+    name: Test Skopt
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.9
+
+      - name: Run Python test
+        run: make pytest-skopt

Makefile

@@ -179,3 +179,13 @@ pytest: prepare-pytest prepare-pytest-testdata
 	PYTHONPATH=$(PYTHONPATH) pytest ./test/unit/v1beta1/suggestion
 	PYTHONPATH=$(PYTHONPATH) pytest ./test/unit/v1beta1/earlystopping
 	PYTHONPATH=$(PYTHONPATH) pytest ./test/unit/v1beta1/metricscollector
+
+# The skopt service doesn't work appropriately with Python 3.11.
+# So, we need to run the test with Python 3.9.
+# TODO (tenzen-y): Once we stop to support skopt, we can remove this test.
+# REF: https://github.com/kubeflow/katib/issues/2280
+pytest-skopt:
+	pip install six
+	pip install --prefer-binary -r test/unit/v1beta1/requirements.txt
+	pip install --prefer-binary -r cmd/suggestion/skopt/v1beta1/requirements.txt
+	PYTHONPATH=$(PYTHONPATH) pytest ./test/unit/v1beta1/suggestion/test_skopt_service.py

cmd/suggestion/skopt/v1beta1/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.11-slim
+FROM python:3.10-slim
 
 ARG TARGETARCH
 ENV TARGET_DIR /opt/katib