fix missing worker index in cli mode

Author: kobenguyent

lib/command/workers/runTests.js

@@ -104,7 +104,9 @@ initPromise = (async function () {
     // important deep merge so dynamic things e.g. functions on config are not overridden
     config = deepMerge(baseConfig, overrideConfigs)
 
-    codecept = new Codecept(config, options)
+    // Pass workerIndex as child option for output.process() to display worker prefix
+    const optsWithChild = { ...options, child: workerIndex }
+    codecept = new Codecept(config, optsWithChild)
     await codecept.init(testRoot)
     codecept.loadTests()
     mocha = container.mocha()