Add option to temporary skip autosnap by setting environment variable

timeshift-autosnap

 #!/bin/bash
 #author: gobonja
 
-if [ $(findmnt / -no fstype) == "overlay" ] ; then
-    echo "==> skipping timeshift-autosnap because system is booted in Live CD mode..."; exit 0;
-fi
+[ $(findmnt / -no fstype) == "overlay" ] && { printf "==> skipping timeshift-autosnap because system is booted in Live CD mode..."; exit 0; }
+
+[[ -v SKIP_AUTOSNAP ]] && { printf "==> skipping timeshift-autosnap due SKIP_AUTOSNAP environment variable being set."; exit 0; }
 
 readonly CONF_FILE=/etc/timeshift-autosnap.conf
 readonly SNAPSHOTS_TO_DELETE=$(mktemp -u --tmpdir ${0##*/}.XXXXXXXX)