Remove the delete local manifest when remote doesn't exist

  Previous impl it calls c.local.DeleteManifest(remoteRepo, art.Tag), because the remoteRepo is incorrect repository and it always delete nothing, to keep consistency with the previous version and code clarity, remove this go routine

Signed-off-by: stonezdj <[email protected]>

src/controller/proxy/controller.go

@@ -172,9 +172,6 @@ func (c *controller) UseLocalManifest(ctx context.Context, art lib.ArtifactInfo,
 		return false, nil, err
 	}
 	if !exist || desc == nil {
-		go func() {
-			c.local.DeleteManifest(remoteRepo, art.Tag)
-		}()
 		return false, nil, errors.NotFoundError(fmt.Errorf("repo %v, tag %v not found", art.Repository, art.Tag))
 	}
 
@@ -220,11 +217,6 @@ func (c *controller) ProxyManifest(ctx context.Context, art lib.ArtifactInfo, re
 	ref := getReference(art)
 	man, dig, err := remote.Manifest(remoteRepo, ref)
 	if err != nil {
-		if errors.IsNotFoundErr(err) {
-			go func() {
-				c.local.DeleteManifest(remoteRepo, art.Tag)
-			}()
-		}
 		return man, err
 	}
 	ct, _, err := man.Payload()