.dockerignore is not excluding pids, storage directories

[rubys]

Steps to reproduce

rm -rf demo
rails new demo --main
cd demo
touch tmp/pids/server.pid
docker buildx build . -t rails-demo
docker run --rm -i -t rails-demo ls -l tmp/pids

Expected behavior

No server.pid in the container

Actual behavior

server.pid file exists in container

System configuration

Rails version: --main

Ruby version:

ruby 3.2.2 (2023-03-30 revision e51014f9c0) [arm64-darwin22]

Additional information

The problem was first reported as App deployment getting stuck at pushing image to fly. The problem was determined to be that the storage directory was being uploaded making the image too big. The identified solution was to remove two lines

 # Ignore pidfiles, but keep the directory.
 /tmp/pids/*
-!/tmp/pids/  # <-- bug: This line should be deleted, is basically making the previous line useless, all files inside /tmp/pids are being sent to the context
 !/tmp/pids/.keep

 # Ignore storage (uploaded files in development and any SQLite databases).
 /storage/*
 !/storage/.keep
 /tmp/storage/*
-!/tmp/storage/ # <-- bug: This line should be deleted, is also making the previous line useless, all files inside /tmp/storage are being sent to the context. This directory had 5.5 GB of data in my case.
 !/tmp/storage/.keep