Due we have limited macOS resources we will keep then bot the branch merges, and other test. Thus we going to disable the macOS test by default on PRs. However will be possible to execute those test manually, with a comment, or adding a label to the PR.

Manually

 Scenario: A developer creates a new PR
    When a developer Launch the beats pipeline from Jenkins UI with the parameter macosTest
    Then a build is triggered  
    And the macOS tests are executed

NOTE: Only users with permissions in the CI will be able to login and trigger the build manually using the UI.

GH Label

 Scenario: A developer creates a new PR
    When a Beat requires macOS test
    Then the test is skipped if the build is not labeled as macOS test needed (label macOS)

NOTE: Only users with write permissions in the repo can add labels to the PR. In addition, builds won't be triggered automatically in the even of a label change.

GH Comment

 Scenario: A developer creates a new PR
    When a developer put the GitHub comment `/test mac` comment 
    Then a build is triggered  
    And the macOS tests are executed

cc @elastic/observablt-robots