repro.sh

#!/bin/bash

cat << EOF > fly.toml
app = "dockerignore"
primary_region = "yul"
kill_timeout = 10
kill_signal = "SIGINT"

[[services]]
  internal_port = 80
  protocol = "tcp"

  [[services.ports]]
    handlers = ["http"]
    port= 80
    [[services.http_checks]]
  grace_period = "5s"
  interval = "5s"
  path = "/"
  protocol = "http"
  timeout = "10s"
EOF

cat << EOF > Dockerfile

from nginx

COPY * /
EOF

mkdir -p build
dd if=/dev/urandom of=build/17mb bs=1024 count=17408

dd if=/dev/urandom of=13mb bs=1023 count=13312

dd if=/dev/urandom of=7mb bs=1023 count=7168

cat << EOF > .dockerignore
build/
13mb
EOF