check repositories update time

src/main

@@ -66,7 +66,12 @@ REQUIRED_PACKAGES=( \
 
 echo "# updating repositories"
 echo "==================="
-sudo apt update
+if [[ $(date --date='-12 hours' +%s) -gt $(date -d "$(stat -c %y /var/lib/apt/lists/partial)" +%s) ]]; then
+    sudo apt update
+    sudo apt autoremove -y
+else
+    echo "repositories recently updated!"
+fi
 
 
 echo "# required packages"