junest: fix --version flag (#350561)

pkgs/by-name/ju/junest/package.nix

@@ -14,11 +14,17 @@ stdenvNoCC.mkDerivation rec {
   dontBuild = true;
 
   installPhase = ''
+    runHook preInstall
+
     mkdir -p $out/bin
     mkdir -p $out/lib
     cp -r $src/bin/ $out/
     cp -r $src/lib/ $out/
+    # cp -r $src/VERSION $out/
+    substituteInPlace $out/bin/junest --replace-fail '$(cat "$JUNEST_BASE"/VERSION)' ${version}
     substituteInPlace $out/lib/core/common.sh --replace-fail "wget" ${lib.getExe wget}
+
+    runHook postInstall
   '';
 
   meta = {