kops_1_15: init at 1.15.0

[kampka]

Motivation for this change

New package version

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

Notify maintainers

cc @zimbatm

[Mic92]

What is the policy for keeping old versions for this package?

[kampka]

What is the policy for keeping old versions for this package?

I don't think there is one yet.
Typically the idea is to not force people to upgrade production clusters whenever nixpkgs updates.
I think it's reasonable to adopt the k8s supported versions model here, which boils down to the lastest three minor versions.

That being said, I would keep the existing versions because 1.12 introduces a breaking change and upgrading from <1.12 to >1.12 is not really supported.

[kampka]

Weekly reminder that this still needs a review.

[kampka]

@Mic92 So how do we make progress here?
This seems like a simple version bump to me, I don't really get why this has to linger here for weeks.

@zimbatm @offlinehacker @ehmry

[zimbatm]

let's cleanup the old versions later. Usually we keep the 3 latest