Nixpkgs: unityhub: network not working

[mkg20001]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Install unityhub
2. Install unity2020 from there and create a new project
3. Try to use the package manager or any service that requires network, it fails with some dns errors

Expected behavior
Network works

Screenshots

Additional context
I'm using a custom DNS setup with stubby DNS that works as it should, unsure if the application is at fault or the userenv is not correctly propagating the DNS config

Notify maintainers
@tesq0

Metadata

• system: "x86_64-linux"
• host os: Linux 5.4.63, NixOS, 21.03pre-git (Okapi)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.3.7
• channels(root): "nixos-20.09pre242769.61525137fd1, nixpkgs, solaros"
• channels(maciej): "nixpkgs-20.09pre242495.3c0e3697520, solaros"
• nixpkgs: /home/maciej/.nix-defexpr/channels/nixpkgs

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute:
- unityhub
# a list of nixos modules affected by the problem
module:

[sgillespie]

I'm getting the same thing, and I don't have any special DNS settings. I suspect it has something to do with:

Curl error 35: Cert handshake failed. verify result: UNITYTLS_X509VERIFY_FATAL_ERROR. error state: 7

EDIT: I found the issue; It's missing a dependency (cacert), if I can find time I'll create a PR tomorrow