perf(cpc): split disk-image-uefi out of disk-image series file
Due to how `disk-image` file is structured, it builds BIOS and UEFI
images at the same time. However, certain images (e.g., GCE images)
require only UEFI image to be built, BIOS image is being simply
discarded. This results in longer build times.
Splitting out `disk-image-uefi` would allow images to use it instead of
`disk-image` and thus avoid building unused BIOS images.
`disk-image` now depends on `disk-image-uefi` for backward
compatibility.
(cherry picked from commit b40ce74fd67bbaa7f9ec94463d8da759724f9fec)
fix: unset initrdless_boot_fallback_triggered instead of setting it to 0
This fixes GCE shielded VM instances integrity monitoring failures on
focal and later. Our images are built with an empty /boot/grub/grubenv
file, however after the first boot `initrdless_boot_fallback_triggered`
is set to 0. This change in `grubenv` results in integrity monitoring
`lateBootReportEvent` error.
It seems that the only thing that's checking for this `grubenv` variable
is `grub-common.service`, and it is looking specifically for a `1`
value:
if grub-editenv /boot/grub/grubenv list | grep -q
initrdless_boot_fallback_triggered=1; then echo "grub:
GRUB_FORCE_PARTUUID set, initrdless boot paniced, fallback triggered.";
fi
Unsetting this variable instead of setting it to 0 would prevent issues
with integrity monitoring.
LP: 1960537 illustrates an issue where the calls to e2fsck in the
umount_partition call are failing due to an open file handle. At this
time, we are unable to find a root cause, and it's causing many builds
to fail for CPC. Adding a sleep 30 as a workaround as the file handle
releases within that timeframe. This does not address root cause.
Bump UEFI disk image size for armhf to 3.5 GB LP:#1953609
Current impish builds fail with:
```
cp: error writing 'mountpoint/var/lib/snapd/snaps/snapd_14067.snap': No space left on device
cp: cannot create directory 'mountpoint/var/lib/snapd/ssl': No space left on device
```
