Feature Request

Currently --addon-config takes a file path, but just like linkerd inject it should be able to take a URL and perform the same install or upgrade

What problem are you trying to solve?

Provide a more easier way for users to apply --addon-config without having to download file and apply.

How should the problem be solved?

same like linkerd inject

What do you want to happen? Add any considered drawbacks.

Any alternatives you've considered?

Is there another way to solve this problem that isn't as good a solution?

How would users interact with this feature?

If you can, explain how users will be able to use this. Maybe some sample CLI
output?