Fixing issue with npm ci when dependency is defined as tar.gz url

[mansona]

This is an issue that a friend of mine noticed when trying out the octane preview on CI, essentially when you define a dependency as a tar.gz url you can sometimes get situations where the _from url is prefixed with the name of the page and an @ symbol.

Steps to reproduce

• ember new ember-quickstart -b @ember/octane-app-blueprint
• cd ember-quickstart && npm test
  • no issues
• npm i && npm test
  • (inside the ember-quickstart); no issues
• npm ci && npm test
  • ERROR: Missing npm packages:

Full error output

Missing npm packages:
Package: ember-source
  * Specified: https://s3.amazonaws.com/builds.emberjs.com/canary/shas/ed897e5a76c5c11010ce810e140e16e3e42417de.tgz
  * Installed: ember-source@https://s3.amazonaws.com/builds.emberjs.com/canary/shas/ed897e5a76c5c11010ce810e140e16e3e42417de.tgz

I don't 100% know the semantics of what this is doing but the change I'm submitting seems to fix it 🤷‍♂️

[quaertym]

Thanks.