gn: run hooks in build phases

Signed-off-by: Marcin Serwin <marcin@serwin.dev>

pkgs/by-name/gn/gn/package.nix

@@ -43,6 +43,8 @@ stdenv.mkDerivation {
   hardeningDisable = [ "format" ];
 
   configurePhase = ''
+    runHook preConfigure
+
     python build/gen.py --no-last-commit-position
     cat > out/last_commit_position.h << EOF
     #ifndef OUT_LAST_COMMIT_POSITION_H_
@@ -53,14 +55,24 @@ stdenv.mkDerivation {
 
     #endif  // OUT_LAST_COMMIT_POSITION_H_
     EOF
+
+    runHook postConfigure
   '';
 
   buildPhase = ''
+    runHook preBuild
+
     ninja -j $NIX_BUILD_CORES -C out gn
+
+    runHook postBuild
   '';
 
   installPhase = ''
+    runHook preInstall
+
     install -vD out/gn "$out/bin/gn"
+
+    runHook postInstall
   '';
 
   setupHook = ./setup-hook.sh;