feat: added workflow validation

[blue4209211]

added workflow validate subcommand

[gemini-code-assist]

Summary of Changes

Hello @blue4209211, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the nbctl command-line interface by adding a new feature for validating workflow definitions. It provides a dedicated command to check the correctness of workflow YAML files against the Nudgebee backend, improving the developer experience by offering immediate feedback and detailed error reporting. The changes also include internal refactorings to support this new functionality and improve testing consistency.

Highlights

• New workflow validate Command: Introduced a new CLI command nbctl workflow validate [file] that allows users to validate a workflow YAML file against the Nudgebee API. This command reads the YAML, injects the account ID if missing, and sends a GraphQL mutation request for validation.
• Enhanced Error Handling: The new validation command includes sophisticated error parsing, specifically designed to drill down into nested Hasura GraphQL errors (e.g., ActionWebhookErrorResponse) to extract and present more user-friendly and actionable error messages from the backend.
• Authenticated HTTP Client: A new NewHTTPClient function has been added to pkg/client to create authenticated http.Client instances. This client handles API key/username authentication and endpoint configuration, including optional verbose logging, and is utilized by the workflow validation logic.
• CLI Experience Improvement: The root Cobra command (nbctl) has been configured with SilenceErrors: true and SilenceUsage: true to prevent Cobra from printing default error messages and usage information, leading to a cleaner and more controlled output for the user.
• Testing Utilities Refactor: The WithViper helper function, used for temporarily setting Viper configurations in tests, has been moved from pkg/testutil to pkg/config for better organization. Additionally, client.ResetClient() was added to RunWithMockServer to ensure a fresh client instance for each test run.

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[gemini-code-assist]

Code Review

This pull request introduces a new workflow validate subcommand to validate workflow definition files. It also includes several refactorings in the test and client packages to support this new functionality. The changes look good overall, adding valuable functionality. I've left a few comments on areas that could be improved for better maintainability and robustness, mainly concerning code duplication in the client setup and complex error parsing logic in the new command. Addressing these points will make the codebase cleaner and more resilient to future changes.