Motivation for this change

Update velero (formely heptio-ark), a utility for managing disaster recovery, specifically for Kubernetes cluster resources and persistent volumes at version 1.5.1. I removed the reference to heptio-ark and added myself as a maintainer next to @mbode. A big thanks to @mtrsk and the brazilian telegram group of NixOS for the help.

NOTE: I did not find a good way to pass the version information, so for now, they are locked directly in the package definition based on the information from the last release and its makefile, I also deactivated the tests, as it gave some sandbox-related errors and the expectation of a kubernetes environment. Perhaps in the future it will be useful to enable some of them.

Things done

Added package definition at pkgs/applications/networking/cluster/velero/default.nix, removed pkgs/applications/networking/cluster/heptio-ark/default.nix and added a reference line to pkgs/top-level/all-packages.nix where heptio-ark was.

• 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.