Add repository initialization action

internal/restic/restic.go

@@ -208,6 +208,9 @@ func (r *Runner) run(ctx context.Context, repo model.Repository, args []string,
 		if errors.Is(ctx.Err(), context.Canceled) {
 			return fmt.Errorf("cancelled: %w", ctx.Err())
 		}
+		if strings.Contains(message, "repository does not exist") || strings.Contains(message, "Is there a repository at the following location?") {
+			return errors.New("repository: destination is not initialized; open Repositories and select Initialize")
+		}
 		return fmt.Errorf("restic: %s: %w", strings.TrimSpace(message), err)
 	}
 	return nil