How to make custom UPM mutable in Add Package from git URL

I can't english well. so Maybe grammertic error is many

I make Custom Unity Package with my company source file.(so code is private repo.)

I want
1. If i edit and update repo(update version tag), package manager demand update button.
2. mutable in inspector using Add Package from git URL
https://docs.unity3d.com/Manual/upm-inspect.html <- unity says without disk all immutable.
3. Using private repo

if upon Can't
1. How to Update version using Add Package form disk