regal: add ldflags to show version

[rinx]

Description of changes

In this pull request, add ldflags to build function of regal package.
I added several flags, mainly for injecting version information.

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/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 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

It works as expected.

[nix-shell:~/.cache/nixpkgs-review/rev-bf911d25639f1a5858578cc7b0e12fadad57eb59]$ ./results/regal/bin/regal version
Version:    0.27.0
Go Version: go1.22.7
Platform:   linux/amd64
Commit:     unknown
Timestamp:  unknown
Hostname:   unknown

• Fits CONTRIBUTING.md.

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[rinx]

@NixOS/nixpkgs-merge-bot merge

[nixpkgs-merge-bot]

@rinx merge not permitted (#305350):
pr author is not in restricted authors list, in the list are: r-ryantm