lab(vagrant): try Vagrant in CI

.github/workflows/terraform.test.yaml

@@ -2,10 +2,19 @@ name: vagrant-up
 
 on: [push]
 
+defaults:
+  run:
+    working-directory: examples/vagrant-k3s
+
 jobs:
   vagrant-up:
-    runs-on: ubuntu-latest
+    runs-on: macos-12
 
     steps:
       - name: Show Vagrant version
         run: vagrant --version
+      - uses: hashicorp/setup-terraform@v2
+      - run: terraform init
+      - run: terraform apply -auto-approve
+      - run: terraform output -json
+      - run: terraform destroy -auto-approve

examples/vagrant-k3s/VagrantFile

@@ -0,0 +1,26 @@
+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+#
+
+Vagrant.configure("2") do |config|
+  config.vm.box = 'generic/alpine313'
+  config.vm.boot_timeout = ENV['TEST_VM_BOOT_TIMEOUT'] || 600 # seconds
+  config.vm.synced_folder '.', '/vagrant', disabled: true
+
+  ['k3s:server:01', 'k3s:server:02', 'k3s:server:03', 'k3s:agent:01', 'k3s:agent:02'].each do |name|
+    config.vm.define name do |vm|
+        vm.vm.hostname = name
+    end
+  end
+
+  %w[libvirt virtualbox vmware_desktop].each do |p|
+    config.vm.provider p do |v|
+      v.cpus = ENV['TEST_VM_CPUS'] || 1
+      v.memory = ENV['TEST_VM_MEMORY'] || 512
+    end
+  end
+  config.vm.provider :virtualbox do |v,o|
+    v.gui = false
+    v.check_guest_additions = false
+  end
+end

examples/vagrant-k3s/main.tf

@@ -0,0 +1,11 @@
+resource "vagrant_vm" "k3s_nodes" {
+  get_ports = true
+}
+
+output "debug_sshconfig" {
+  value = nonsensitive(vagrant_vm.k3s_nodes.ssh_config)
+}
+
+output "debug_ports" {
+  value = nonsensitive(vagrant_vm.k3s_nodes.ports)
+}

examples/vagrant-k3s/versions.tf

@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    vagrant = {
+      source  = "bmatcuk/vagrant"
+      version = "4.1.0"
+    }
+  }
+}