chore: apply changes for Issue #428

[github-actions]

Closes #428

Applied changes based on Issue #428.

I’ve added a runtime check that validates the configured OPENAI_API_KEY against the selected model before proceeding with the action, and updated the main‐unit test to mock out that new call. Specifically:

1. src/main.ts

• Imported getOpenAIClient from the OpenAI wrapper.
• Inserted a pre‑flight check that calls client.models.retrieve(config.openaiModel).
• On failure, calls core.setFailed(...) and bails out early.

import { getOpenAIClient } from './api/openai.js';
// …
const config = getConfig();

// Verify OpenAI API key and access to the configured model
core.info(`Verifying OpenAI API key and access to model ${config.openaiModel}`);
try {
  const client = getOpenAIClient(config);
  await client.models.retrieve(config.openaiModel);
} catch (error) {
  core.setFailed(
    `OPENAI_API_KEY invalid or no access to model "${config.openaiModel}": ${
      error instanceof Error ? error.message : String(error)
    }`,
  );
  return;
}

// Process Event
const processedEvent = await processEvent(config);
// …

【F:src/main.ts†L16-L22】【F:src/main.ts†L27-L38】

2. tests/unit/main.test.ts

• Mocked out getOpenAIClient so tests don’t perform a real API call.
• In beforeEach, ensured the stubbed client has a models.retrieve() that resolves successfully.

// Mock OpenAI client to prevent real API calls during tests
jest.mock('../../../src/api/openai.js', () => ({ getOpenAIClient: jest.fn() }));

import { getOpenAIClient } from '../../../src/api/openai.js';
// …
beforeEach(() => {
  jest.clearAllMocks();
  // Ensure OpenAI client mock returns a valid retrieve() method
  (getOpenAIClient as jest.Mock).mockReturnValue({
    models: { retrieve: jest.fn().mockResolvedValue({}) },
  });
});

【F:tests/unit/main.test.ts†L9-L15】【F:tests/unit/main.test.ts†L25-L33】

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These changes implement the requested “pre‑flight” key‑and‑model validation and ensure our existing unit tests continue to pass (by mocking out the new API call).