Add contrib/terraform/opennebula: provision Kubespray VMs on OpenNebula (#13390)

contrib/terraform/opennebula/default.tfvars

@@ -0,0 +1,50 @@
+prefix = "k8s"
+
+# Prefer an absolute path (relative paths resolve against the module directory):
+# inventory_file = "/path/to/inventory/mycluster/inventory.ini"
+
+# Existing OpenNebula objects
+template_name = "i-did-not-read-the-docs" # e.g. ubuntu2404-context
+network_name  = "i-did-not-read-the-docs" # e.g. private
+
+# Node counts (nodes are named master-0.., worker-0..)
+master_count = 1
+worker_count = 2
+
+# Advanced alternative: named nodes and/or static IPs. Takes precedence over
+# master_count/worker_count when set.
+# machines = {
+#   "master-0" : {
+#     "node_type" : "master",
+#     "ip" : "" # optional static IP from an address range of the network, e.g. 192.168.0.10
+#   },
+#   "worker-0" : {
+#     "node_type" : "worker",
+#     "ip" : ""
+#   }
+# }
+
+ssh_public_keys = [
+  # Put your public SSH key here
+  "ssh-rsa I-did-not-read-the-docs",
+]
+
+# SSH user for the generated inventory (one-context installs keys for root
+# on standard OpenNebula marketplace images)
+# ansible_user = "root"
+
+## Sizing
+# master_vcpu      = 2
+# master_memory    = 4096
+# worker_vcpu      = 4
+# worker_memory    = 8192
+# master_disk_size = 0 # MB; 0 keeps the template disk size
+# worker_disk_size = 0 # MB; 0 keeps the template disk size
+
+## OpenNebula extras
+# additional_disk_size     = 0  # MB; extra DATABLOCK disk on every node
+# image_datastore_name     = "" # required when additional_disk_size > 0
+# masters_anti_affinity    = false
+# network_reservation_size = 0  # carve an address reservation out of network_name
+# network_reservation_first_ip = "" # pin the reserved range's first IP
+# network_reservation_ar_id    = null # parent address-range ID to reserve from (null = provider default)