Add Vagrant CI for Ubuntu 20.04 (#6279)

.gitlab-ci/vagrant.yml

@@ -47,3 +47,8 @@ vagrant_ubuntu18-weave-medium:
   stage: deploy-part2
   extends: .vagrant
   when: manual
+
+vagrant_ubuntu20-flannel:
+  stage: deploy-part2
+  extends: .vagrant
+  when: on_success
\ No newline at end of file

docs/ci.md

@@ -17,7 +17,7 @@ opensuse |  :x: | :white_check_mark: | :x: | :x: | :x: | :x: | :x: | :x: | :x: |
 oracle7 |  :x: | :white_check_mark: | :x: | :x: | :x: | :x: | :x: | :x: | :x: |
 ubuntu16 |  :x: | :white_check_mark: | :x: | :white_check_mark: | :white_check_mark: | :x: | :white_check_mark: | :x: | :white_check_mark: |
 ubuntu18 |  :white_check_mark: | :x: | :white_check_mark: | :x: | :white_check_mark: | :x: | :x: | :x: | :white_check_mark: |
-ubuntu20 |  :white_check_mark: | :x: | :x: | :x: | :x: | :x: | :x: | :x: | :x: |
+ubuntu20 |  :white_check_mark: | :x: | :x: | :x: | :white_check_mark: | :x: | :x: | :x: | :x: |
 
 ## crio
 

tests/files/vagrant_ubuntu20-flannel.rb

+$os = "ubuntu2004"
+
+# For CI we are not worries about data persistence across reboot
+$libvirt_volume_cache = "unsafe"
+
+# Checking for box update can trigger API rate limiting
+# https://www.vagrantup.com/docs/vagrant-cloud/request-limits.html
+$box_check_update = false
+$vm_cpus = 2
\ No newline at end of file

tests/files/vagrant_ubuntu20-flannel.yml

+---
+# Kubespray settings
+
+kube_network_plugin: flannel
+
+deploy_netchecker: true
+dns_min_replicas: 1
\ No newline at end of file