More modern defaults

See merge request !178

We have amber-phone and bullseye.

We leave the logic for kernel downloads in place but we're almost
exclusively building plain nowadays.

We leave the support in place in case we want to add another
repo for bootstraping purposes but the repos and arm01 aren't
filled in anymore.

Byzantium has needed packages now.

This reverts commit 76561094.

Enable luks support

Closes #57

See merge request !177

This works around librem5-devkit-base putting an
unencrypted root device into flash-kernel's boot
args.

librem5-devkit-tools#32

Using '-l' will encrypt the root partition with the given password

Support evergreen

See merge request !176

Increase Librem 5 image size

See merge request !175

byzantium: Use non-https URLs for the moment

See merge request !174

Space is tight during installations and even more so with byzatium
so free enough room.

The https ones hit I/O errors on the server side.

Support byzantium

See merge request !173

This is only needed until we have everything in. Building
byzantium now will help us to see problems compared to
Bullseye.

This uses landing and CI to get off the ground but
we can reduce step by step.

Set flash-kernel's machint type based on board revision

See merge request !172

This will allow to build differnt images until uboot catches up.

Revert "Make amber-phone images possible right now"

See merge request !170

This reverts commit 1c342b2a.

We can use plain amber again.

Make amber-phone images possible right now

See merge request !169

amber-phone-staging has about everything now but amber-phone
is still waiting for transitions. So in order to be able to
have images with a correct source.list bootstrap with
amber-phone-staging and switch back to amber-phone afterwards.

This can be removed in about a week when packages transitioned,
we can also drop 0037c22d then.

pureos: Temporarily add amber-proposed-upates

See merge request !168

We only need this until librem5-devkit-base >= 0.0.3 migrated but without
that we don't get a bootable kernel.

root.sh: Add plymouth's default theme configuration

See merge request !165

Increase image sizes by 300M to compensate for bigger /boot partition

See merge request !167

conf/board: Increase the boot partition size to 512M

See merge request !166

Currently used 200M is too small to hold the kernels
before autoremoval logic has a chance to kick in.

Allow to build against Debian Bullseye too

See merge request !164

On PureOS Amber that is less of a concern since it's stable now (and we
could use pinning) and on bullseye we don't care yet

Update ci repo key

See merge request !163

I thought we'd get them but it's stored in the repo. This
will move into a deb package too.

Temporarily drop gnome-dev from x86 images

See merge request !162

It can't install due to

librem5-base!136

so let's drop that until the package migrated.

board: Adjust to branch rename

See merge request !161

The linux-next branch lost it's 'linux-' to avoid confusion
with upstream's linux-next tree.