Fix dnf5 deferred transaction and add shadow-utils for user creation

iridium_installer/backend/os_install.py

@@ -125,6 +125,8 @@ def install_minimal_os(mount_root, releasever="43"):
         "systemd",
         "systemd-boot-unsigned",
         "dnf",
+        "shadow-utils",
+        "util-linux",
         "efibootmgr",
         "passwd",
         "rootfiles",
@@ -156,13 +158,12 @@ def install_minimal_os(mount_root, releasever="43"):
             "--disablerepo=*",
             f"--repofrompath=iridium-iso,{iso_repo}",
             "--enablerepo=iridium-iso",
-            "--offline",
             "--cacheonly",
         ]
     else:
         logger.warning("ISO repository not found in common locations. DNF might try to use network.")
-        # Try to at least prevent some network usage
-        dnf_args = ["--offline"]
+        # Note: Avoid --offline in dnf5 as it defers the transaction to next boot.
+        dnf_args = []
 
     cmd = [
         "dnf",