fix: changing default numWorkers, making it customizable and refactoring scheduler (#1563)

Signed-off-by: Lisca Ana-Roberta <ana.kagome@yahoo.com>

pkg/storage/local/local.go

@@ -1769,7 +1769,7 @@ type taskGenerator struct {
 	done     bool
 }
 
-func (gen *taskGenerator) GenerateTask() (scheduler.Task, error) {
+func (gen *taskGenerator) Next() (scheduler.Task, error) {
 	repo, err := gen.imgStore.GetNextRepository(gen.lastRepo)
 
 	if err != nil && !errors.Is(err, io.EOF) {

pkg/storage/local/local_test.go

@@ -26,6 +26,7 @@ import (
 	. "github.com/smartystreets/goconvey/convey"
 
 	zerr "zotregistry.io/zot/errors"
+	"zotregistry.io/zot/pkg/api/config"
 	"zotregistry.io/zot/pkg/common"
 	"zotregistry.io/zot/pkg/extensions/monitoring"
 	"zotregistry.io/zot/pkg/log"
@@ -48,7 +49,7 @@ const (
 var errCache = errors.New("new cache error")
 
 func runAndGetScheduler() (*scheduler.Scheduler, context.CancelFunc) {
-	taskScheduler := scheduler.NewScheduler(log.Logger{})
+	taskScheduler := scheduler.NewScheduler(config.New(), log.Logger{})
 	taskScheduler.RateLimit = 50 * time.Millisecond
 
 	ctx, cancel := context.WithCancel(context.Background())