ci: add macOS test job alongside Linux CI #4827
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Summary
This PR extends Alertmanager CI by adding a macOS test job alongside the existing Linux-based tests.
Linux tests continue to run inside the containerized
golang-builderimage with required mail service dependencies, while macOS tests run natively without containers or service services, respecting GitHub Actions runner limitations.Motivation
Alertmanager binaries are built for multiple platforms, but CI tests were previously executed only on
ubuntu-latest. Adding macOS test coverage improves confidence across supported platforms without changing existing Linux CI behavior.Notes
Fixes #4754