Question Trailing glow around ui border

Hello, how do I go about doing an avatar that has a trailing shine glow around its border that's animating in circle? Something like the avatars in mobile legends?

 

You might try doing it in 2 steps:

1. create the rotating glow, like a radar sweep
2. then apply a mask to that sweep that matches the border

 

That will give it a trailing shine only on the edge of the borders? Sorry, I'm new and learning...