Install ember-cli-update globally

[erikap]

Allows to easily update Ember apps using edi ember-cli-update without installing ember-cli-update as a project dependency.

[madnificent]

Thanks for the PR. What would be the reason to install this package globally and not some other packages?

[erikap]

For the current release https://guides.emberjs.com/release/upgrading/ refers to https://cli.emberjs.com/release/basic-use/upgrading/ which indicates to use ember-cli-update. Installing this globally for current versions would best match current expectations.

[Windvis]

I wouldn't install it at all and simply run it with npx. edi npx ember-cli-update should work, no? That way you get the latest version or have direct control over the version that gets used instead of the version that got installed when the image was built.