workflows: macos: Add workflow for MacOS builds on PRs

[robskillington]

Adding regular MacOS builds for PRs to avoid frequently breaking MacOS builds.

There have been several recent regressions with MacOS builds. These failures have not always effected MacoS 14 but sometimes just MacOS 12 for instance. These still should be caught before PRs are merged given Windows builds are tested before merge on each PR.

Fixes #9004 which was filed because this seems to regularly occur. I think we can close out that issue and be confident it won't come back if we merge this and perform MacOS builds before each PR is merged.

For related fixes where main was broken for some period of time, see the extra out of band work that was performed adhoc (since these failures are not checked before PR merge):

• flb_utils.c: fix for macOS < 12 #9217
• node_exporter_metrics: Fix macOS build #8048

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[patrick-stephens]

We can test a full package build already via label.

I think the concern of doing it every time is the cost and time of the builds.

@edsiper I think we should pick a subset to do always or just always do the packaging build rather than keep adding workflows?

[cosmo0920]

We already have a macOS workflow which has unit-testing: https://github.com/fluent/fluent-bit/blob/master/.github/workflows/unit-tests.yaml#L80
Is there any lack of mechanism to detect failing of macOS builds in this workflow?
https://github.com/fluent/fluent-bit/blob/master/.github/workflows/unit-tests.yaml

[patrick-stephens]

We already have a macOS workflow which has unit-testing: https://github.com/fluent/fluent-bit/blob/master/.github/workflows/unit-tests.yaml#L80 Is there any lack of mechanism to detect failing of macOS builds in this workflow? https://github.com/fluent/fluent-bit/blob/master/.github/workflows/unit-tests.yaml

The only thing I can see with this is we generally just ignore failing there at the moment as the tests flake. But yeah we do build for multiple macOS variants already if unit tests pass for Linux first.

I'm all for more tests around this but we should update the others I think as well, e.g. if we're doing a macOS build always then we can remove it from the larger full package test triggered by a label.