Hello, i have followed the with-docker example to the letter. The only problem I've had so far is in these lines:

COPY --from=builder /app/out/json/ .
COPY --from=builder /app/out/yarn.lock ./yarn.lock
RUN yarn install

Here we copy json folder of pruned version of turborepo which contains only the package.json files of each app and it's package/lib dependencies (e.x. tsconfig) which include only package.json files as well.

The problem is every time i install and then exec the container with bash, i can see that /app/apps/my-app/node_modules/my-package has just the package.json. It doesn't have the built files because the package is empty in the first place. I am very confused as to why a yarn install with empty dependencies would work anyway. Then the example does this:

# Build the project
COPY --from=builder /app/out/full/ .
RUN yarn turbo run build --filter=web...

Now we have something like this:
|── app
|──── apps
|────── my-app
|─────── node_modules
|──────── my-lib@1.0.0
|───────── package.json (only this file)
|──── packages
|───── my-package
|────── ...files (now we have them cause we copied full folder)

So my question is how exactly is this supposed to work? Am i missing something?