added minimal image

MINIMAL.md

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+# Minimal Cloud Images
+
+## Cloud-Init Image
+
+How to prepare a cloud-init image.
+
+### Ubuntu 20.04
+
+Download the latest version of the base image to one of your proxmox nodes:
+
+```
+curl -sSL https://cloud-images.ubuntu.com/minimal/releases/focal/release/ubuntu-20.04-minimal-cloudimg-amd64.img >/tmp/ubuntu-20.04-minimal-cloudimg-amd64.img
+```
+
+Create a cloud-init config to bootstrap the template:
+```
+cat <<'EOF'> /var/lib/vz/snippets/9003_bootstrap
+#cloud-config
+package_update: true
+package_upgrade: true
+ntp:
+  enabled: true
+  servers: ["pool.ntp.org"]
+  ntp_client: systemd-timesyncd
+ssh_deletekeys: true
+ssh_genkeytypes: ["ed25519", "rsa"]
+bootcmd:
+- |
+  sed -i 's/ENABLED=1/ENABLED=0/' /etc/default/motd-news
+  systemctl disable motd-news.service motd-news.timer --now
+runcmd:
+- |
+  curl -sSL https://git.giftfish.de/ston1th/cleanup/raw/branch/master/ubuntu_2004_min.sh >/tmp/cleanup.sh
+  [ "$(sha256sum /tmp/cleanup.sh|cut -d" " -f1)" = "9fbd939eb8d1ef6157a61bb984a5045339ce361596b8a99a8847280cc785b726" ] && sh /tmp/cleanup.sh || echo "error: cleanup script hash does not match" >&2
+power_state:
+  mode: poweroff
+EOF
+```
+
+Create the template VM:
+```
+qm stop 9003; qm destroy 9003
+qm create 9003 --name ubuntu-2004-min --memory 2048 --net0 virtio,bridge=vmbr0
+qm importdisk 9003 /tmp/ubuntu-20.04-minimal-cloudimg-amd64.img local
+qm set 9003 --scsihw virtio-scsi-pci --scsi0 local:9003/vm-9003-disk-0.raw
+qm set 9003 --ide0 local:cloudinit
+qm set 9003 --boot c --bootdisk scsi0
+qm set 9003 --serial0 socket --vga serial0
+qm set 9003 --cicustom "user=local:snippets/9003_bootstrap"
+qm set 9003 --ipconfig0 ip=dhcp,ip6=dhcp
+
+qm start 9003
+sleep 10;while :; do qm status 9003|grep -q stopped && break; done
+qm set 9003 --cicustom ""
+qm set 9003 --ipconfig0 ""
+qm template 9003
+```

TODO

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+remove 18.04 fat cloud images