Remove AppImage custom image building

I don't daily-drive it and it needs refactor anyway

Author: fiftydinar

.github/workflows/build.yml

@@ -30,7 +30,7 @@ jobs:
         recipe:
           # !! Add your recipes here
           - recipe.yml
-          - recipe-appimages.yml
+
     steps:
       # the build is fully handled by the reusable github action
       - name: Build Custom Image