ci: add XAI_API_KEY to integration test workflow

[Kamilbenkirane]

Add XAI_API_KEY environment variable to the integration-test job in publish.yml workflow to support XAI provider integration tests.

[claude]

PR Review: Add XAI_API_KEY to integration test workflow

✅ Summary

This PR adds the XAI_API_KEY environment variable to the integration-test job in the publish workflow, enabling XAI provider integration tests during the release process.

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Code Quality & Best Practices ✅

Positive:

• Consistency: The change follows the established pattern of other provider API keys (OPENAI_API_KEY, ANTHROPIC_API_KEY, GOOGLE_API_KEY, etc.) in lines 56-61
• Alphabetical ordering concern: While the change is functionally correct, the API keys are currently listed in a specific order. XAI_API_KEY is added at the end after BYTEDANCE_API_KEY, which maintains insertion order but not alphabetical order
• Completeness: The change aligns with:
  • XAI provider implementation in packages/text-generation/src/celeste_text_generation/providers/xai/
  • XAI credential handling in src/celeste/credentials.py:40
  • XAI integration tests in packages/text-generation/tests/integration_tests/
  • XAI entry in .env.example:29

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Potential Issues ✅

None identified - This is a straightforward configuration change with no code logic.

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Security Considerations ✅

Secure implementation:

• ✅ Uses GitHub Secrets (${{ secrets.XAI_API_KEY }}) - credentials are not hardcoded
• ✅ Runs in the integration-tests environment (line 48), providing proper environment isolation
• ✅ Follows the same security pattern as all other provider API keys
• ✅ The secret needs to be configured in GitHub repository settings under the integration-tests environment

Action required:

• Ensure XAI_API_KEY secret is configured in GitHub repository settings → Secrets and variables → Actions → Environment secrets → integration-tests

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Performance Considerations ✅

No performance impact:

• Adding an environment variable has negligible overhead
• Integration tests already run in parallel (--dist=worksteal -n auto per Makefile:44)
• XAI tests are part of the existing parametrized test suite

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Test Coverage ✅

Well covered:

• ✅ XAI provider is included in integration tests:
  • test_generate.py - line 15: (Provider.XAI, "grok-3-mini", {})
  • test_stream.py - includes XAI streaming tests
• ✅ Without this change, XAI integration tests would fail during the publish workflow due to missing credentials
• ✅ This change is necessary for the existing XAI integration tests to pass in the publish workflow

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Additional Observations

1. Missing from CI workflow: The ci.yml workflow does not run integration tests (only unit tests), so this change appropriately targets only the publish.yml workflow where integration tests are executed before release

2. Consistency check: All providers with integration tests now have their API keys configured:

   • Text generation: OpenAI, Anthropic, Google, Mistral, Cohere, Bytedance, XAI ✅
   • Credentials mapping: All providers in PROVIDER_CREDENTIAL_MAP ✅

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Recommendation

LGTM! ✅ Approve and merge

This is a necessary and well-implemented change that:

• Enables XAI integration testing in the publish workflow
• Follows security best practices
• Maintains consistency with other provider configurations
• Has no side effects or risks

Before merging: Verify that the XAI_API_KEY secret is configured in the GitHub repository's integration-tests environment.