lens: init at 4.2.4

[glottologist]

Motivation for this change

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 nixpkgs-review --run "nixpkgs-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.

[legendofmiracles]

Any reason why are you extracting the appimage, instead of compiling it from source?
The nixpkgs manual has this to say on appimages:

They are meant to be used if traditional packaging from source is infeasible, or it would take too long.

[glottologist]

There are issues with the Yarn version that is installed when building on NixOS from source. I can retroactively change the pkg to build from source once that is fixed

[teto]

would this replace pkgs/applications/networking/cluster/lens/default.nix ?

[glottologist]

I hadn't seen cluster lens so this can be closed in favour of that.