Add Bazzite configuration file for ISO boot (#60)

* Add Bazzite configuration file for ISO boot

* Detect ISOs on all MultiOS-USB partitions#49

* Add probe command for CD label detection

---------

Co-authored-by: MexIT <25229673+Mexit@users.noreply.github.com>

Author: bl4ckswordsman

config/bazzite/bazzite.cfg

@@ -0,0 +1,33 @@
+# Bazzite (Fedora Atomic-based Live ISO)
+# https://bazzite.gg
+
+iso_pattern="bazzite-*.iso"
+
+for isofile in ($dev,*)$iso_dir/$iso_pattern; do
+	if [ -e "$isofile" ]; then
+		regexp --set=isoname "$iso_dir/(.*)" "$isofile"
+
+		submenu "$isoname ->" "$isofile" "$iso_dir/$isoname" {
+			iso_path="$3"
+			LOOPBACK "$2"
+			probe --label --set=cd_label (loop)
+			isocfg="iso-scan/filename=$iso_path"
+			bootoptions="root=live:CDLABEL=$cd_label rd.live.image enforcing=0 quiet rhgb"
+			linux_path="(loop)/images/pxeboot/vmlinuz"
+			initrd_path="(loop)/images/pxeboot/initrd.img"
+
+			menuentry "Launch Bazzite Installer" {
+				echo Loading kernel...
+				linux $linux_path $isocfg $bootoptions
+				echo Loading initrd...
+				initrd $initrd_path
+			}
+			menuentry "Launch Bazzite Installer (Basic Graphics Mode)" {
+				echo Loading kernel...
+				linux $linux_path $isocfg $bootoptions nomodeset
+				echo Loading initrd...
+				initrd $initrd_path
+			}
+		}
+	fi
+done