Fix media location search for EL8

EL8 distributions marked the 'OS' as dracut, workaround by trying to use PRETTY_NAME

confluent_osdeploy/el8/initramfs/usr/lib/dracut/hooks/pre-trigger/01-confluent.sh

@@ -228,6 +228,15 @@ if [ "$textconsole" = "true" ] && ! grep console= /proc/cmdline > /dev/null; the
 fi
 
 . /etc/os-release
+if [ "$ID" = "dracut" ]; then
+    ID=$(echo $PRETTY_NAME|awk '{print $1}')
+    VERSION_ID=$(echo $VERSION|awk '{print $1}')
+    if [ "$ID" = "Oracle" ]; then
+        ID=OL
+    elif [ "$ID" = "Red" ]; then
+        ID=RHEL
+    fi
+fi
 ISOSRC=$(blkid -t TYPE=iso9660|grep -Ei ' LABEL="'$ID-$VERSION_ID|sed -e s/:.*//)
 if [ -z "$ISOSRC" ]; then
     echo inst.repo=$proto://$mgr/confluent-public/os/$profilename/distribution >> /etc/cmdline.d/01-confluent.conf