refactor: put StripTagMeta into formatter package

Avoid circular import.

pkg/formatter/formatter.go

@@ -8,6 +8,7 @@ import (
 	"github.com/docker/go-units"
 	"github.com/olekukonko/tablewriter"
 	"github.com/schollz/progressbar/v3"
+	"github.com/sirupsen/logrus"
 )
 
 func ShortenID(str string) string {
@@ -49,3 +50,22 @@ func CreateProgressbar(length int, title string) *progressbar.ProgressBar {
 		progressbar.OptionSetDescription(title),
 	)
 }
+
+// StripTagMeta strips front-matter image tag data that we don't need for parsing.
+func StripTagMeta(image string) string {
+	originalImage := image
+
+	if strings.Contains(image, "docker.io") {
+		image = strings.Split(image, "/")[1]
+	}
+
+	if strings.Contains(image, "library") {
+		image = strings.Split(image, "/")[1]
+	}
+
+	if originalImage != image {
+		logrus.Debugf("stripped %s to %s for parsing", originalImage, image)
+	}
+
+	return image
+}