[Nix-dev] Use PHP FPM with 2 PHP versions simultaneously

[Danylo Hlynskyi]

Apart from container solution, there are no easy ways to do this.
1. You can patch nixpkgs and add option `phpPackage` per-pool, that
overrides global `phpPackage`
2. You can use `lib.mkForce` like here:

systemd.services.phpfpm-your-pool-name.serviceConfig = lib.mkForce {
  Slice = "phpfpm.slice";
  PrivateDevices = true;
  ProtectSystem = "full";
  ProtectHome = true;
  NoNewPrivileges = true;
  RestrictAddressFamilies = "AF_UNIX AF_INET AF_INET6";
  Type = "notify";
  ExecStart = "${phpPackage}/bin/php-fpm -y ${cfgFile} -c ${phpIni}";
  ExecReload = "${pkgs.coreutils}/bin/kill -USR2 $MAINPID";
}

but this (2a) breaks abstraction [1] and (2b) requires you to supply your
own ${cfgFile} and ${phpIni}

[1] especially beacuse of https://github.com/NixOS/nixpkgs/issues/23921
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