added support for dnf package manager

https://code.launchpad.net/~sanjay-ankur/byobu/byobu/+merge/415959

debian/changelog

@@ -7,8 +7,11 @@ byobu (6.11) unreleased; urgency=medium
   * usr/bin/byobu-launcher-install.in:
     - Fix for VSCode, fish and byobu installations
     - https://github.com/dustinkirkland/byobu/commit/f917d2169afdec623f5b32723d93bfd91d34b92f#commitcomment-137955113
+  * usr/lib/byobu/updates_available:
+    - added support for dnf package manager
+    - https://code.launchpad.net/~sanjay-ankur/byobu/byobu/+merge/415959
 
- -- Dustin Kirkland <kirkland@ubuntu.com>  Sat, 10 Feb 2024 10:56:13 -0600
+ -- Dustin Kirkland <kirkland@ubuntu.com>  Sat, 10 Feb 2024 11:03:36 -0600
 
 byobu (6.10-0ubuntu1) noble; urgency=medium
 

usr/lib/byobu/updates_available

@@ -85,6 +85,9 @@ ___update_cache() {
 		# Wolfi updates are cheap (~1s); so update cache every time
 		apk update 2>&1 >/dev/null
 		apk upgrade --simulate | grep -c " Upgrading " >$mycache 2>/dev/null &
+	elif eval $BYOBU_TEST dnf >/dev/null; then
+		# If dnf exists, use it
+		flock -xn "$flock" dnf list --upgrades -q -y | grep -vc "Available Upgrades" >$mycache 2>/dev/null &
 	fi
 }
 
@@ -141,6 +144,9 @@ ___update_needed() {
 		# formulae database was updated
 		[ "$(brew --prefix)/Library/Formula" -nt "$mycache" ]
 		return $?
+	elif [ -e "/var/cache/dnf/packages.db" ]; then
+		[ "/var/cache/dnf/packages.db" -nt "$mycache" ]
+		return $?
 	fi
 	return 1
 }