Update 'installer.sh'

installer.sh

@@ -174,6 +174,15 @@ apt autoremove -y
 hostnamectl set-hostname $domain
 sed -i 's/;preserve_hostname: false/preserve_hostname: true/g' /etc/cloud/cloud.cfg
 timedatectl set-timezone Europe/Amsterdam
+if free | awk '/^Swap:/ {exit !$2}'; then
+    echo "swap enabled"
+else
+    fallocate -l 1G /swapfile
+    chmod 600 /swapfile
+    mkswap /swapfile
+    swapon /swapfile
+    echo '/swapfile swap swap defaults 0 0' >> /etc/fstab
+fi
 sed -i 's/#/vm.swappiness=10/g' /etc/sysctl.conf
 sed -i 's/#/vm.vfs_cache_pressure=50/g' /etc/sysctl.conf