openvpn: adding missing mainProgram value

[D3vil0p3r]

Description of changes

Added missing mainProgram attribute to allow maintainers of packages depending on openvpn to use lib.getExe function.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.05 Release Notes (or backporting 23.05 and 23.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

---

Add a 👍 reaction to pull requests you find important.

[github-actions]

Successfully created backport PR for release-23.11:

• [Backport release-23.11] openvpn: adding missing mainProgram value #281742

[nevivurn]

SGTM.

Also unrelated to this PR, but given that the reason for the generic {} stuff has been removed (added in #103019, removed in #212184), it can probably be cleaned up?

[h7x4]

I'm a bit perplexed that the commit had a timestamp in the future. Do you have some timezone issues with your git by any chance? @D3vil0p3r

[D3vil0p3r]

I'm a bit perplexed that the commit had a timestamp in the future. Do you have some timezone issues with your git by any chance? @D3vil0p3r

Hey. I see the commit time right... 18 January 2024 11:20 AM (GMT+1). Which date do you see?

[h7x4]

If you look at the timeline in this PR, you can see that the commit has been pushed down past the merge and past nevivurns comment. During the time of merge, GitHub said something like committed in 5 minutes

Might be just a GitHub issue