ci: new docker release workflows

cmd/version.go

@@ -6,14 +6,14 @@ import (
 	"github.com/spf13/cobra"
 )
 
-var version = "(untracked)"
+var version = "untracked"
 
 func init() {
 	rootCmd.AddCommand(&cobra.Command{
 		Use:   "version",
 		Short: "Print the version number",
 		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Println("WebDAV version " + version)
+			fmt.Printf("WebDAV version: %q", version)
 		},
 	})
 }