Confused about working with Docker guide for monorepos

[Jiralite]

Guide: https://pnpm.io/docker#example-2-build-multiple-docker-images-in-a-monorepo

For the monorepo example specifically, we see dist already exists before we are shown the Dockerfile. No problem, I can assume I can add that in the Dockerfile in a prior step to running pnpm deploy.

What immensely confuses me is the last section at the bottom of the page for pnpm deploy:

If there is a .gitignore file in the application directory then any files listed here are ignored.

Going back to the monorepo example, we see a .gitignore. The output, dist, will obviously be in this. So... won't that example simply... fail? pnpm deploy will not even copy dist because it is ignored, no?