Fails on lockfileVersion: 3

[kevincox]

When running there are many errors of the following form as well as a lot of gobbledygook as it appears that multiple messages are being character-by-character concurrently.

No such tarball
CallStack (from HasCallStack):
  error, called at Main.hs:212:8 in main:Main
No such tarball

To reproduce:

1. Download https://gitlab.com/kevincox/filepush/-/commit/08f97910ef4d8e99fa1878938ecd2c2edea1398d as a publicly-available example. (Exact commit is not relevant, just pinning a reference)
2. Run nix-build and observe that it succeeds.
3. Run npm install--lockfile-version 3 --package-lock-only.
4. Run nix-build and observe that it fails.

[kevincox]

Unless you need a v3 lockfile this can be worked around by downgrading the lockfile:

npm install --lockfile-version 2 --package-lock-only

It seems that current versions of npm default to a v3 lockfile but will not upgrade from v2 to v3 automatically.

[mdarocha]

Done in #58