Merge http/* into build-inside-vm.sh

See merge request archlinux/arch-boxes!146

Use zstd for initramfs compression

See merge request archlinux/arch-boxes!134

Only run the "build" job on runner with fast-single-thread

See merge request archlinux/arch-boxes!151

Some of our runners is vey slow and building on them takes +1 hour and
we need to adjust many of the timeouts, so let's just build on the fast
runners.

Reverting as this is only needed on very slow machines, and it didn't
really fix the problem, as it just fails on another line due to a
timeout.

This reverts commit ad830608.

Bump timeout for initial serial read (30s->60s)

See merge request archlinux/arch-boxes!150

TCG is slow and hitting the timeout under initial boot isn't uncommon.

Use stub-resolv.conf for /etc/resolv.conf

Closes #123

See merge request archlinux/arch-boxes!149

build-inside-vm.sh:
Change the source of `/etc/resolv.conf` to point to
`/run/systemd/resolve/stub-resolv.conf`, as it provides support for
per-interface resolving [1].

Fixes #123

[1] https://www.freedesktop.org/software/systemd/man/systemd-resolved.service.html#/etc/resolv.conf

Increase reflector speed

Closes #122

See merge request archlinux/arch-boxes!148

http/install-common.sh:
Instead of `--age 12` use `--latest 20` as parameter to `reflector`
which brings down the mirrorlist creation from over two minutes to about
12s.

Fixes #122

Order pacman-init before cloud-final

Closes #121

See merge request archlinux/arch-boxes!147

http/install-common.sh:
Order pacman-init.service and reflector-init.service before
cloud-final.service, as the latter may install packages using pacman and
will introduce a broken pacman keyring if started simultaneously with
pacman-init.service.
The mirrorlist should be set before cloud-final.service is running, so
that pacman can use it.

.gitlab-ci.yml:
When testing the cloud image using cloud-init:
* Use the `packages` and `runcmd` directives to install packages using
  cloud-init (which is done during `cloud-final.service`).
* Check for packages installed via cloud-init.
* Write a test file to disk and check for its existence.

Fixes #121

Add test in CI pipeline

See merge request archlinux/arch-boxes!107

Add libisoburn as dependency for xorriso

See merge request archlinux/arch-boxes!145

Remove qemu-guest-agent + removing vagrant only stuff from the cloud-image

Closes #89

See merge request archlinux/arch-boxes!142

https://github.com/archlinux/svntogit-packages/commit/6186b2ae881a762c6373f9a2497e13e27dd52bfe

cloud-init handles it + most of the "user and groups"-module options is
ignored if the user already exist.

[1] https://cloudinit.readthedocs.io/en/latest/topics/modules.html#users-and-groups

cloud-init is responsible for handling it in the cloud-image.

Fix #89

I'm not sure polkit is needed in the vagrant images, but it is
definitely not needed in the cloud-image.

It has never be enabled, makes zero sense in a cloud-image and isn't
used by vagrant.

cloud-image: Add cloud-guest-utils so cloud-init can expand the root partition

See merge request archlinux/arch-boxes!144

https://cloudinit.readthedocs.io/en/latest/topics/modules.html#growpart

Readd "remove machine-id" logic

Closes #117

See merge request archlinux/arch-boxes!141

Even though the system isn't booted, a machine-id is generated when
systemd is installed (by the .install script).

Fixes: 0b60f5a4 ("Remove "remove machine-id" logic")

Fix #117