feat: appimage package script

revert: flutter lock file

Cargo.toml

@@ -20,6 +20,7 @@ inline = []
 hbbs = []
 cli = []
 with_rc = ["simple_rc"]
+appimage = []
 use_samplerate = ["samplerate"]
 use_rubato = ["rubato"]
 use_dasp = ["dasp"]