feat: integrate OIDC token exchange in GitHub Action

- Add setupGitHubInstallationToken utility for OIDC token generation
- Implement automatic token exchange with Pullfrog API endpoint
- Add support for multiple authentication methods (input, env, OIDC)
- Create setup utilities for test repository management
- Update action entry point to handle new token flow
- Add environment variable documentation for API key
- Remove large bundled dependencies and optimize build
- Support both development and production token workflows

fixtures/basic.ts

@@ -1,7 +1,13 @@
 import type { MainParams } from "../main";
 
 const testParams = {
-  prompt: "List all files in the current directory, then create a file called dynamic-test.txt with the content 'This was loaded from a TypeScript file!', then delete it."
+  inputs: {
+    prompt:
+      "List all files in the current directory, then create a file called dynamic-test.txt with the content 'This was loaded from a TypeScript file!', then delete it.",
+    anthropic_api_key: "sk-test-key",
+  },
+  env: {},
+  cwd: process.cwd(),
 } satisfies MainParams;
 
 export default testParams;