bootstrap: feat: Add apt update script that checks last run time

.config/yadm/bootstrap.d/zz-aptUpdate.sh

@@ -0,0 +1,10 @@
+lastAptUpdateSeconds=$(date +%s -r /var/cache/apt/pkgcache.bin)
+currentSeconds=$(date +%s)
+diffSeconds=$(($currentSeconds - $lastAptUpdateSeconds))
+echo "apt update was last run $diffSeconds second(s) ago"
+
+# Run apt update if it has not been run for more than 30 minutes
+if [[ "$diffSeconds" -gt 1800 ]]; then
+    echo 'Running apt update...'
+    sudo apt update
+fi