feat: support case expression function#6102
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Adds the `case(pred1, val1, ..., default)` function recently introduced to GitHub Actions expressions, returning the value paired with the first truthy predicate (or the trailing default). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
caseexpression function:case(pred1, val1, pred2, val2, ..., default)returns the value paired with the first truthy predicate, or the trailing default.casein the expression interpreter and in the YAML schema's function list (3..N args).Closes #6006
Test plan
go test ./pkg/exprparser/... ./pkg/schema/...passescaseexpression #6006 viaactand confirm it no longer errors