Add GitHub Actions tools for workflow management

Overview

This PR implements comprehensive GitHub Actions support for the MCP server, adding 14 new tools that enable complete workflow and CI/CD management through the GitHub Actions API.

New Tools Added

Workflow Management (Read-only)

• list_workflows - List all workflows in a repository
• list_workflow_runs - List workflow runs for a specific workflow with filtering options
• get_workflow_run - Get detailed information about a specific workflow run
• get_workflow_run_logs - Download logs for a workflow run
• get_workflow_run_usage - Get usage metrics and billing information for workflow runs

Job Management (Read-only)

• list_workflow_jobs - List jobs for a specific workflow run
• get_job_logs - Download logs for a specific workflow job

Artifact Management (Read-only)

• list_workflow_run_artifacts - List artifacts generated by a workflow run
• download_workflow_run_artifact - Get download URLs for workflow artifacts

Workflow Operations (Write)

• run_workflow - Trigger workflows via workflow_dispatch events
• rerun_workflow_run - Re-run entire workflow runs
• rerun_failed_jobs - Re-run only failed jobs in a workflow run
• cancel_workflow_run - Cancel running workflows

Administrative (Destructive)

• delete_workflow_run_logs - Delete workflow run logs (marked as destructive)

Key Features

✅Complete CI/CD Workflow Support - Covers the full lifecycle from triggering workflows to managing artifacts
✅Proper Permission Classification - Tools are correctly categorized as read-only, write, or destructive operations
✅Comprehensive Parameter Validation - All tools include proper input validation and error handling
✅Rich Metadata - Each tool includes detailed descriptions and parameter documentation
✅Test Coverage - Full test suite with 50+ test cases covering all scenarios
✅Documentation - Updated README with detailed tool descriptions and usage examples

Implementation Details

• Architecture: Follows existing MCP server patterns and conventions
• Error Handling: Consistent error responses with meaningful messages
• Pagination: Supports GitHub API pagination for list operations
• Filtering: Includes advanced filtering options (by status, actor, branch, event, etc.)
• Security: Proper handling of GitHub tokens and permissions

Testing

• Added comprehensive test suite inactions_test.go
• 50 test cases covering all tools and edge cases
• Mocked GitHub API responses for reliable testing
• All tests passing with proper error handling validation

Breaking Changes

None - this is purely additive functionality.

Closes

Closes#268 - Add support for Actions APIs

Usage Example

# List workflows in a repositoryecho'{"tool":"list_workflows","arguments":{"owner":"github","repo":"github-mcp-server"}}'| github-mcp-server# Trigger a workflowecho'{"tool":"run_workflow","arguments":{"owner":"github","repo":"github-mcp-server","workflow_file":"ci.yml","ref":"main"}}'| github-mcp-server