Revert "fix: add simple concurrency limit (nektos#823)"

This reverts commit 4d552e6.

pkg/runner/runner.go

@@ -123,16 +123,7 @@ func (runner *runnerImpl) NewPlanExecutor(plan *model.Plan) common.Executor {
 		for r, run := range stage.Runs {
 			job := run.Job()
 			matrixes := job.GetMatrixes()
-			maxParallel := 4
-			if job.Strategy != nil {
-				maxParallel = job.Strategy.MaxParallel
-			}
-
-			if len(matrixes) < maxParallel {
-				maxParallel = len(matrixes)
-			}
 
-			b := 0
 			for i, matrix := range matrixes {
 				rc := runner.newRunContext(run, matrix)
 				rc.JobName = rc.Name
@@ -159,14 +150,9 @@ func (runner *runnerImpl) NewPlanExecutor(plan *model.Plan) common.Executor {
 						return nil
 					})(common.WithJobErrorContainer(WithJobLogger(ctx, jobName, rc.Config.Secrets, rc.Config.InsecureSecrets)))
 				})
-				b++
-				if b == maxParallel {
-					pipeline = append(pipeline, common.NewParallelExecutor(stageExecutor...))
-					stageExecutor = make([]common.Executor, 0)
-					b = 0
-				}
 			}
 		}
+		pipeline = append(pipeline, common.NewParallelExecutor(stageExecutor...))
 	}
 
 	return common.NewPipelineExecutor(pipeline...).Then(handleFailure(plan))