Add option to set the maximum number of tags to watch for an item if watch_repo is enabled

pkg/docker/tags.go

@@ -8,20 +8,30 @@ import (
 type Tags []string
 
 // Tags returns tags of a Docker repository
-func (c *RegistryClient) Tags(image registry.Image) (Tags, error) {
+func (c *RegistryClient) Tags(image registry.Image, max int) (Tags, int, error) {
 	ctx, cancel := c.timeoutContext()
 	defer cancel()
 
 	imgCls, err := c.newImage(ctx, image.String())
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 	defer imgCls.Close()
 
 	tags, err := docker.GetRepositoryTags(ctx, c.sysCtx, imgCls.Reference())
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 
-	return Tags(tags), err
+	// Reverse order (latest tags first)
+	for i := len(tags)/2 - 1; i >= 0; i-- {
+		opp := len(tags) - 1 - i
+		tags[i], tags[opp] = tags[opp], tags[i]
+	}
+
+	if max > 0 && len(tags) >= max {
+		return Tags(tags[:max]), len(tags), nil
+	}
+
+	return Tags(tags), len(tags), nil
 }