Build CentOS QCOW2 images with Packer

This leverages Packer infrastructure for building QCOW2 images and adds
CentOS 6, 7, and 8 jobs.  Each job starts Qemu/KVM virtual machine
inside a Docker container.  The end result is installed and configured
CentOS image, which is later wrapped into a Docker image and pushed to
GitLab Container Registry.
25 jobs for mnowak/packer_build_kvm_images in 8 minutes and 43 seconds (queued for 14 seconds)
Status Job ID Name Coverage
  Images
manual #565383
amd64 docker linux allowed to fail manual
alpine_3.10_amd64
manual #565384
amd64 docker linux allowed to fail manual
alpine_3.11_amd64
manual #565385
amd64 docker linux allowed to fail manual
centos_centos6_amd64
passed #565388
amd64 docker linux allowed to fail manual
centos_centos6_qcow

00:06:42

manual #565386
amd64 docker linux allowed to fail manual
centos_centos7_amd64
passed #565389
amd64 docker linux allowed to fail manual
centos_centos7_qcow

00:08:42

manual #565387
amd64 docker linux allowed to fail manual
centos_centos8_amd64
passed #565390
amd64 docker linux allowed to fail manual
centos_centos8_qcow

00:06:33

manual #565395
amd64 docker linux allowed to fail manual
debian_buster_amd64
manual #565402
i386 docker linux allowed to fail manual
debian_buster_i386
manual #565393
amd64 docker linux allowed to fail manual
debian_jessie_amd64
manual #565400
i386 docker linux allowed to fail manual
debian_jessie_i386
manual #565396
amd64 docker linux allowed to fail manual
debian_sid_amd64
manual #565397
arm64 docker linux allowed to fail manual
debian_sid_arm64
manual #565403
allowed to fail manual
debian_sid_i386
manual #565394
amd64 docker linux allowed to fail manual
debian_stretch_amd64
manual #565401
i386 docker linux allowed to fail manual
debian_stretch_i386
manual #565391
amd64 docker linux allowed to fail manual
fedora_30_amd64
manual #565392
amd64 docker linux allowed to fail manual
fedora_31_amd64
manual #565407
amd64 docker linux allowed to fail manual
packager_rpm
manual #565404
amd64 docker linux allowed to fail manual
tumbleweed_latest_amd64
manual #565399
amd64 docker linux allowed to fail manual
ubuntu_bionic_amd64
manual #565406
i386 docker linux allowed to fail manual
ubuntu_bionic_i386
manual #565398
amd64 docker linux allowed to fail manual
ubuntu_xenial_amd64
manual #565405
i386 docker linux allowed to fail manual
ubuntu_xenial_i386