Enable Pull Request Size GiHub App

[coreydaley]

Install/configure https://github.com/marketplace/pull-request-size/ for the shipwright-io organization.

[coreydaley]

/assign @qu1queee @SaschaSchwarze0

[SaschaSchwarze0]

I enabled it. It seems that it does not add the labels to existing pull requests. At least not immediately. Let's wait for the first label(s) to appear. Then, we can close this.

[coreydaley]

It sized this pull request: shipwright-io/operator#138