Don't set initramfs compression to zstd as it's the default now[1]

See merge request !163

[1] https://archlinux.org/news/moving-to-zstandard-images-by-default-on-mkinitcpio/

Dynamic allocation for file descriptors used in ./build-host.sh

Closes #135

See merge request archlinux/arch-boxes!162

Visual studio code had an issue with file descriptors already used by the integrated terminal.
This commit asks bash to dynamically assign a "free" file descriptor to be used in the expect function.
Closes #135

Make disk size configurable per image

Closes #127

See merge request archlinux/arch-boxes!160

It is meant for local usage so the disk should be "big enough".

cloud-init resizes the disk[1] so we don't need a "big disk" with a lot
of unused space + some cloud providers charges for the unused space +
some cloud providers offers VM with disk < 20GB.

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

Fix #127

Use the fast fast-single-thread runner when using qemu for testing

See merge request archlinux/arch-boxes!161

The fast-single-thread runner is much faster (test-cloudimg-qemu):
3min 39sec[1] vs 8min 37sec[2]

[1] https://gitlab.archlinux.org/klausenbusk/arch-boxes/-/jobs/14739
[2] https://gitlab.archlinux.org/klausenbusk/arch-boxes/-/jobs/14746

Add basic image

See merge request archlinux/arch-boxes!158

It is similar to the cloud-image but it comes with a preconfigured arch
user (pw: arch) and lacks cloud-init.

Use --reflink=always when copying the fallback initramfs

See merge request archlinux/arch-boxes!159

It saves us ~20MB.

Fix swapfile "insecure permissions"

See merge request archlinux/arch-boxes!156

This isn't really necessary as /swap is mode 0700, but a warning is
logged in the journal[1], so let's set /swap/swapfile to mode 0600 and
get rid of the warning.

[1] swapon[189]: swapon: /swap/swapfile: insecure permissions 0644, 0600 suggested.

Fix boot issues caused by missing modules in the initramfs

See merge request archlinux/arch-boxes!155

The mkinitcpio autodetect hook removes modules not needed by the
running system from the initramfs. This make the image non-bootable
on some systems as initramfs lacks the relevant kernel modules.
Ex: Some systems need the virtio-scsi kernel module and not the
"autodetected" virtio-blk kernel module for disk access.

So for the initial install we use the fallback initramfs, and
"autodetect" should add the relevant modules to the initramfs when
the user updates the kernel.

Do explicit mirror resolve with curl

See merge request archlinux/arch-boxes!154

host suddenly doesn't understands hostname with https://. I'm not sure
it did before, it could be DNS server doing some magic.

Verify vagrant public SSH key

See merge request archlinux/arch-boxes!153

Use source for sourcing instead of .

See merge request archlinux/arch-boxes!152

It improves readability according to some..

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