[Bug 2115811] Re: Increase the default imagesize in CPC's disk-image binary

[Chloé Smith]

The fix in the MP has now been implemented in CPC's own production
`livecd-rootfs` (via our ~cloudware fork [0]) and is working there as
well, so the MP should be good to go.

[0]: https://code.launchpad.net/~cloudware/livecd-rootfs/+git/livecd-
rootfs/+ref/questing

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https://bugs.launchpad.net/bugs/2115811

Title:
  Increase the default imagesize in CPC's disk-image binary

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  CPC's download and GCE base questing images are failing with a `No
  space left on device` error when the binary hits `grub-install`.

  This implies that the livecd-rootfs default of 2.2GB is now just a bit
  too small. `grub-pc` && `grub2-common` don't seem to have exploded in
  size, so it's probably just the culmination of all the packages
  increasing in size gradually.

  I successfully built a GCE image with the default increased to 2.5GB -
  and the output of `df` just before the `grub-install` was interesting:

  ```
  + chroot mountpoint df --all --human-readable --print-type
  Filesystem     Type        Size  Used Avail Use% Mounted on
  /dev/loop3p1   ext4        2.4G  2.1G  310M  88% /
  dev-live       devtmpfs    4.0M     0  4.0M   0% /dev
  devpts-live    devpts         0     0     0    - /dev/pts
  proc-live      proc           0     0     0    - /proc
  sysfs-live     sysfs          0     0     0    - /sys
  securityfs     securityfs     0     0     0    - /sys/kernel/security
  /dev/vda1      ext4         77G   13G   64G  17% /sys/kernel/security/apparmor/features
  /dev/vda1      ext4         77G   13G   64G  17% /proc/sys/kernel/seccomp/actions_avail
  none           cgroup2        0     0     0    - /sys/fs/cgroup
  none           tmpfs       7.9G  4.0K  7.9G   1% /tmp
  none           tmpfs       7.9G  127M  7.7G   2% /var/lib/apt/lists
  none           tmpfs       7.9G   97M  7.8G   2% /var/cache/apt
  + chroot mountpoint grub-install /dev/loop3
  Installing for i386-pc platform.
  Installation finished. No error reported.
  ```

  as it does indeed imply that we were just skirting the ceiling of
  2.2GB until now.

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