Add wipe_disk.sh

* This will allow to run a quick script to wipe the headers
  of the disk, so that we don't have to login after a
  re-comission of the machine to manually reboot it

TODO.md

@@ -2,9 +2,9 @@
 
 1. add the hypervisor as a flag rather then the configuration file when adding
    hypervisors.
-1. Add script to cloud-init, that will allow to wipe disk. This will allow to
+1. ~~Add script to cloud-init, that will allow to wipe disk. This will allow to
    reboot the hypervisor, such that we don't have to log back in after the
-   machine has been re-commissioned.
+   machine has been re-commissioned.~~
 1. ~~Update hypervisor config such that it works with focal~~
 1. Add the ability to add multiple storage pools (1 x SSD, 1 x HDD)
 1. Update `boostrap-maas.sh`

user-data.yaml

@@ -70,6 +70,13 @@ write_files:
     usermod -a -G libvirt,libvirt-qemu virsh
   permissions: '0755'
   owner: root:root
+- path: /root/wipe_disk.sh
+  content: |
+    #!/bin/bash
+
+    dd if=/dev/zero of=/dev/sda bs=1M count=1000
+  permissions: '0755'
+  owner: root:root
 
 # Runs any command that we need to run post install
 runcmd: