gitlab_runner: Add VM based executor (libvirt-executor)

For some workloads running in a container is too restrictive, ex:
arch-boxes (loop device, filesystem mount, pacstrap) and archiso
(pacstrap). Currently they both run a TCG accelerated QEMU VM, which is
very slow and painful to work with. We should provide a better option to
our users!

This adds a hardware accelerated VM for this kinds of workloads, which
is way faster and you can do whatever you like (mostly)!

Fix #283

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TODO:

• Enable KSM?
• Get archiso to build
  • Done: https://gitlab.archlinux.org/klausenbusk/archiso/-/pipelines/10976
• Use BUILD_FAILURE_EXIT_CODE and SYSTEM_FAILURE_EXIT_CODE: https://docs.gitlab.com/runner/executors/custom.html#error-handling
• Fix existing users to use the secure-vm tag

marked this merge request as draft

changed title from Custom executor to Draft: Custom executor (libvirt)

changed the description

mentioned in merge request !384 (closed)

added 1 commit

• c4cd0279 - cleanup libvirt role

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• ed7f98f2 - fixes + cleanup

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added 410 commits

• ed7f98f2...b98bd572 - 386 commits from branch archlinux:master
• 752ab938 - Add libvirt role
• 4fc2ccfa - libvirt: default network (WIP should be tested)
• 5bd9d2da - libvirt: start default network
• 0aac935f - gitlab_runner: Add libvirt-executor
• 81b06ddd - image_path + download from mirror.pkgbuild.com
• 5678aa7d - cleanup commit
• 1a22af08 - libvirt-executor-vm-template.{service,timer} install
• ac09efdd - ssh keys + user-data
• 59eccc0f - cleanup user-data
• a83e8caf - remove commented-out code
• 1d7ad1c5 - user-data PUBLIC_SSH_KEY
• 08c7d0da - sed / -> :
• eac032c9 - libvirt: cdrtools for virt-install
• 750a0187 - FIXME: bump timeout
• ea3c97a4 - Note: FIXME: Reboot after updating?
• 1395f263 - runner1.archlinux.org: vault_gitlab_vm_runner_token
• 30be77dd - vm runner
• bbf461e6 - Don't echo VM ip
• 2e22ea69 - better vm name
• cb81d042 - echo vm name not return
• 94cc34b1 - s/-/_
• c00b75eb - maybe revert CUSTOM_ENV_CI_JOB_ID
• 366161ff - Remove machine-id (used by dhcp)
• 55a8e9be - Revert "maybe revert CUSTOM_ENV_CI_JOB_ID"

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changed the description

added 1 commit

• d392566d - Revert "Don't echo VM ip"

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