Using ubuntu-latest might result in incompatibilities when this image
changes to a different version of Ubuntu. For example, the Ubuntu 24.04
image no longer includes imagemagick, meaning that we'll have to install
it manually when using Ubuntu 24.04.
We've been doing manually for too long ;).
The reason why we're assigning the author is it makes it easy to filter
pull requests by assignee on our kanban; it isn't so easy (actually,
might be impossible) to filter by author.