use function in ansible

images/linux/scripts/installers/ansible.sh

@@ -6,10 +6,12 @@
 
 # Source the helpers for use with the script
 source $HELPER_SCRIPTS/document.sh
-LSB_RELEASE=$(lsb_release -rs)
+source $HELPER_SCRIPTS/os.sh
+
+imageLabel=$(getOSVersionLabel)
 
 # ppa:ansible/ansible doesn't contain packages for Ubuntu20.04
-if [ LSB_RELEASE != "20.04" ]; then
+if [ $imageLabel != "focal" ]; then
     add-apt-repository ppa:ansible/ansible
     apt-get update
 fi