feat(init): print success message and next steps after devbox init

Author: Lagoja

internal/boxcli/init.go

@@ -42,6 +42,9 @@ func initCmd() *cobra.Command {
 			if err != nil {
 				return err
 			}
+			if flags.dryRun {
+				return nil
+			}
 			fmt.Fprintf(cmd.OutOrStdout(), "Created devbox.json in %s\n", path)
 			fmt.Fprintln(cmd.OutOrStdout(), "Run `devbox add <package>` to add packages, or `devbox shell` to start a dev shell.")
 			return nil