Update CI/CD Workflow and Dependencies

[kichristensen]

Summary

This pull request introduces the following changes to the repository:

GitHub Actions Workflow Updates

• Updated .github/workflows/build.yml:
  • Added support for workflow_dispatch, push, and pull_request events.
  • Introduced environment variable MAGEFILE_VERBOSE for verbose logging.
  • Upgraded actions:
    • actions/checkout from v2 to v4.
    • actions/setup-go from v2 to v5 with caching enabled.
  • Replaced custom integration test steps with mage commands:
    • mage Build for building.
    • mage Test for testing.
    • mage Publish for publishing (conditional on push events).
  • Added GITHUB_TOKEN for publishing.

Dependency Updates

• Updated go.mod:
  • Bumped get.porter.sh/magefiles from v0.6.10 to v0.6.11.
  • Bumped golang.org/x/sync from v0.11.0 to v0.13.0.
• Updated go.sum to reflect the above changes.

Motivation

• Modernize the CI/CD pipeline by leveraging the latest GitHub Actions features and versions.
• Simplify and standardize build, test, and publish steps using mage.
• Keep dependencies up-to-date for better performance and security.