[patch] exclude openshift integration tests from standard CI run

Add `-m "not openshift"` to pytest invocation in python-package.yml
to prevent OLM integration tests from running in environments without
the IBM operator catalog installed.

Tests in test_olm.py require a live OpenShift cluster with ibm-sls
available in openshift-marketplace. The `openshift` marker was already
defined in pyproject.toml but was not being applied during CI.

Author: prveenkumr

.github/workflows/python-package.yml

@@ -46,7 +46,7 @@ jobs:
           cat ${GITHUB_WORKSPACE}/src/mas/devops/__init__.py
           python -m pip install --upgrade pip
           pip install .[dev]
-          python -m pytest
+          python -m pytest -m "not openshift"
 
       - name: Lint with flake8
         run: |