pkg/imagefilter/formatter.go: add GetSupportedOutputFormats

Provides an interface so this can be printed on help output or similar.

pkg/imagefilter/formatter.go

@@ -17,12 +17,18 @@ const (
 	OutputFormatText      OutputFormat = "text"
 	OutputFormatJSON      OutputFormat = "json"
 	OutputFormatTextShell OutputFormat = "shell"
-<<<<<<< HEAD
 	OutputFormatTextShort OutputFormat = "short"
-=======
->>>>>>> 964154d40 (pkg/imagefilter/formatter: add `shell` output)
 )
 
+func GetSupportedOutputFormats() []string {
+	return []string{
+		string(OutputFormatText),
+		string(OutputFormatJSON),
+		string(OutputFormatTextShell),
+		string(OutputFormatTextShort),
+	}
+}
+
 // ResultFormatter will format the given result list to the given io.Writer
 type ResultsFormatter interface {
 	Output(io.Writer, []Result) error