fix: retain libevent

Author: darora

scripts/90-cleanup-qemu.sh

@@ -44,6 +44,7 @@ elif [ -n "$(command -v apt-get)" ]; then
 
   source /etc/os-release
 
+  apt-mark manual libevent-2.1-7 # required for pgbouncer
   apt-get -y remove --purge ansible-core apport appstream bash-completion bcache-tools bind9-dnsutils bind9-host bind9-libs bolt btrfs-progs byobu command-not-found console-setup distro-info eject fonts-ubuntu-console friendly-recovery ftp fwupd gawk gdisk keyboard-configuration libvolume-key1 libicu66 libssl-dev lvm2 lxd-agent-loader man-db mdadm modemmanager mtd-utils nano netcat-openbsd nfs-common ntfs-3g parted pastebinit screen strace thin-provisioning-tools tmux usb-modeswitch vim vim-runtime wget whiptail xfsprogs
   apt remove -y --purge libc6-dev linux-libc-dev libevent-dev libpcre3-dev libsystemd-dev