minifai: run instsoft hook

usr/lib/grml-live/minifai

@@ -193,9 +193,6 @@ def run_class_scripts(conf_dir: Path, chroot_dir: Path, class_name: str, helper_
 def install_packages_for_classes(conf_dir: Path, chroot_dir: Path, classes: list[str], dynamic_state: DynamicState):
     """Run equivalent of "instsoft" task: set debconf selections and install packages listed in package lists."""
 
-    if should_skip_task(dynamic_state, "instsoft"):
-        return
-
     # debconf is not Essential. Ensure it is installed, so we can use debconf-set-selections.
     chrooted_apt_satisfy(chroot_dir, "debconf")
     for class_name in classes:
@@ -562,7 +559,12 @@ def _run_tasks(conf_dir: Path, chroot_dir: Path, classes: list[str], hostname: s
 
         with policy_rcd(chroot_dir):
             task_updatebase(chroot_dir, dynamic_state)
-            install_packages_for_classes(conf_dir, chroot_dir, classes, dynamic_state)
+
+            if not should_skip_task(dynamic_state, "instsoft"):
+                for class_name in classes:
+                    run_fai_script(chroot_dir, conf_dir / "hooks" / f"instsoft.{class_name}", helper_tools_path, hook_env)
+
+                install_packages_for_classes(conf_dir, chroot_dir, classes, dynamic_state)
 
         if not should_skip_task(dynamic_state, "configure"):
             for class_name in classes: