add github action to test cross-compilation on macos

[alphanota]

Fixes: #nnn
Related: Relevant tracking issues, for context
Merge before/after: Dependent or prerequisite PRs

Description

User facing changes (remove if N/A)

Follow-up Work (remove if N/A)

[code-review-assist]

Hi team,

I'm currently reviewing this pull request and will provide feedback shortly. In the meantime, here's a summary for you and other reviewers to quickly get up to speed:

This pull request adds a GitHub Action to test cross-compilation of Skaffold on macOS. The intent is to improve the testing coverage and ensure compatibility across different operating systems.

Here's a breakdown of the changes:

• A new GitHub workflow file, .github/workflows/compile-mac.yaml, has been added.
• This workflow defines a job that runs on macOS and cross-compiles Skaffold for several platforms (linux-amd64, darwin-amd64, windows-amd64.exe, linux-arm64, darwin-arm64).
• The workflow utilizes the actions/checkout, actions/setup-go, and actions/cache actions to manage the checkout, Go setup, and caching of build artifacts.
• The workflow includes steps to check the Go version, build Skaffold, and potentially install it (though the installation step isn't explicitly defined in the provided diff).

The workflow triggers on both push and pull request events, ensuring that cross-compilation tests are run for every PR and commit to the main branch.

I'll be checking the specifics of the build process, the caching strategy, and the overall robustness of the workflow. I'll also verify that the chosen Go version is appropriate and that the cross-compilation targets are comprehensive.

---

A little haiku to brighten your day:

Mac builds now take flight,
Cross-compiling, swift and sure,
Skaffold's wings unfurl.

[code-review-assist]

This pull request adds a GitHub action to test cross-compilation on macOS. The approach is generally correct, but there are several areas for improvement regarding naming, platform specification, and the use of matrix strategies. Also, consider adding a step to verify the built binaries.