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Run `npm ci` insted of `npm install` in CircleCI
This is a follow up to https://github.com/mozilla-services/screenshots/pull/4617. Once we have a new enough version of npm (5.10+ I think), we should update the CircleCI config to run npm ci instead of npm install.
Kicking this into the backlog until we upgrade to nodejs 10.x.
Depends on #4804