Automatically accept "dnf mark" commands.

diskimage-builder is failing on my fedora 41 and 42 builds with errors
like this:

2025-09-10 02:13:46.792 | > + dnf mark user tcpdump [...snip...]
[...snip...]
2025-09-10 02:57:54.213 | > Transaction Summary:
2025-09-10 02:57:54.213 | >  Changing reason:   14 packages
2025-09-10 02:57:54.213 | >
2025-09-10 02:57:54.213 | > After this operation, 0 B extra will be used (install 0 B, remove 0 B).
2025-09-10 02:57:54.213 | > Is this ok [y/N]: Operation aborted by the user.
2025-09-10 02:57:54.213 | returncode: 1
2025-09-10 02:57:54.213 | install-packages failed with returncode 1

If we sprinkle in some -y goodness, then my builds work.

Change-Id: I74278bce29e00a1bf1768447622d95728bd8fa41
Signed-off-by: Michael Still <mikal@stillhq.com>

diskimage_builder/elements/yum/bin/install-packages

@@ -146,9 +146,9 @@ if [ -n "$WHITELIST" ]; then
 
     if [ "$ACTION" == "install" ]; then
         if [ ${YUM} == "dnf" ] && [ -z "$DNF5" ]; then
-            dnf mark install $PKGS
+            dnf -y mark install $PKGS
         elif [ ${YUM} == "dnf" ] && [ -n "$DNF5" ]; then
-            dnf mark user $PKGS
+            dnf -y mark user $PKGS
         fi
     fi
     $_xtrace