0878c6df19b83ce5a5cae93e49ea6e2646433c6f
macos (not macos:host)
In act_runner a label is `<name>:<backend>`; `:host` is the execution- backend schema (run on host, no container), not part of the label. The runner registered as `macos:host` therefore has the label `macos`, which is what runs-on must reference.
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