make use of IsAdmin

cmd/launcher/main.go

@@ -9,6 +9,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	townuser "git.tilde.town/tildetown/town/user"
 	"github.com/spf13/cobra"
 	"gopkg.in/yaml.v3"
 )
@@ -30,24 +31,7 @@ func isAdmin() (bool, error) {
 	if err != nil {
 		return false, fmt.Errorf("failed to get information about current user: %w", err)
 	}
-
-	adminGroup, err := user.LookupGroup("admin")
-	if err != nil {
-		return false, fmt.Errorf("failed to get admin group info: %w", err)
-	}
-
-	groupIds, err := u.GroupIds()
-	if err != nil {
-		return false, fmt.Errorf("failed to get groups info: %w", err)
-	}
-
-	for _, groupId := range groupIds {
-		if groupId == adminGroup.Gid {
-			return true, nil
-		}
-	}
-
-	return false, nil
+	return townuser.IsAdmin(u)
 }
 
 func parseCommands(targetCmd *cobra.Command, path string) error {