ci: don't run integrations tests without openai api key

CI runs from PR done from forks are failing the integrations tests step
because the OPENAI_API_KEY secret is not available to them.

Author: xrmx

.github/workflows/ci.yml

@@ -72,7 +72,7 @@ jobs:
       working-directory: ${{ env.working_dir }}
     - run: pytest
       working-directory: ${{ env.working_dir }}
-    - if: ${{ env[matrix.python-version] == '3.12' && !env[matrix.openai-version] }}
+    - if: ${{ env[matrix.python-version] == '3.12' && !env[matrix.openai-version] }} && ${{ secrets.OPENAI_API_KEY }} != ''
       # Only run on latest python and openai client version because we are calling openai
       run: pytest --integration-tests
       working-directory: ${{ env.working_dir }}