Add cirrus CI

.cirrus.yml

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+container:
+  image: potyarkin/molecule:host-kvm
+  kvm: true
+  cpu: 2
+  memory: 4G
+
+lint_task:
+  install_script:
+    - apt-get -y update
+    - apt-get -y dist-upgrade
+    - apt-get -y install shellcheck
+    - apt-get -y clean
+  check_script:
+    - shellcheck rootfs.sh
+
+run_task:
+  # Required background services
+  dbus_background_script:
+    - mkdir -p /var/run/dbus
+    - /usr/bin/dbus-daemon --system --nofork --nopidfile
+  virtlogd_background_script:
+    - /usr/sbin/virtlogd
+  libvirtd_background_script:
+    - sleep 2 && /usr/sbin/libvirtd
+  iptables_legacy_script:
+    - update-alternatives --set iptables /usr/sbin/iptables-legacy
+  deps_script:
+    - apt-get -y update
+    - apt-get -y dist-upgrade
+    - apt-get -y install sudo git cpio linux-image-4.19.0-13-amd64 expect wget
+    - apt-get -y clean
+  submodule_script:
+    - git submodule update --init --recursive
+  kernel_script:
+    - cp /boot/vmlinuz-4.19.0-13-amd64 ./kernel
+  run_script:
+    - ./.cirrus.expect | tee -a /tmp/run.log
+    - grep -q 'Bootstrapping completed.' /tmp/run.log