fix: path dependencies during runtime (#181)

We weren't ensuring `systemd-detect-virt` was available at runtime. Just by chance it has been, but when implementing an activation script to detect report changes for `nixos-facter-modules` I noticed this issue.

Signed-off-by: Brian McGee <[email protected]>

nix/packages/nixos-facter/default.nix

@@ -44,13 +44,10 @@ in
 
     nativeBuildInputs = with pkgs; [
       gcc
+      makeWrapper
       pkg-config
     ];
 
-    runtimeInputs = with pkgs; [
-      util-linux
-    ];
-
     ldflags = [
       "-s"
       "-w"
@@ -59,6 +56,15 @@ in
       "-X github.com/numtide/nixos-facter/pkg/build.System=${pkgs.stdenv.hostPlatform.system}"
     ];
 
+    postInstall = let
+      binPath = lib.makeBinPath (with pkgs; [
+        systemdMinimal
+      ]);
+    in ''
+      wrapProgram "$out/bin/nixos-facter" \
+          --prefix PATH : "${binPath}"
+    '';
+
     passthru.tests = (import ./tests) args;
 
     meta = with lib; {