Terraform support for UpCloud (#7360)

* terraform support for UpCloud

* terraform support for UpCloud

* terraform support for UpCloud

* terraform support for UpCloud

* terraform support for UpCloud

* terraform support for UpCloud

* terraform support for UpCloud

* Updates to README.md and main.tf files

* formatting and updating readme

* added a .terraform_validate CI job

* fixed format issue

* added sample inventory

* added symbolic link to group_vars

* added missing tf variables and minor fixes

* added text formatting

* minor formatting fixes

contrib/terraform/upcloud/modules/kubernetes-cluster/main.tf

@@ -0,0 +1,66 @@
+
+resource "upcloud_server" "master" {
+  for_each = {
+    for name, machine in var.machines :
+    name => machine
+    if machine.node_type == "master"
+  }
+
+  hostname    = "${each.key}.${var.hostname}"
+  cpu            = each.value.cpu
+  mem       = each.value.mem
+  zone            = var.zone
+
+  template {
+  storage = var.template_name
+  size = each.value.disk_size
+  }
+
+  # Network interfaces
+ network_interface {
+   type = "public"
+ }
+
+ network_interface {
+   type = "utility"
+ }
+ # Include at least one public SSH key
+ login {
+   user = var.username
+   keys = var.ssh_public_keys
+   create_password = false
+
+ }
+
+}
+
+
+resource "upcloud_server" "worker" {
+  for_each = {
+    for name, machine in var.machines :
+    name => machine
+    if machine.node_type == "worker"
+  }
+
+  hostname    = "${each.key}.${var.hostname}"
+  cpu            = each.value.cpu
+  mem       = each.value.mem
+  zone            = var.zone
+
+  template {
+  storage = var.template_name
+  size = each.value.disk_size
+  }
+
+  # Network interfaces
+ network_interface {
+   type = "public"
+ }
+
+ # Include at least one public SSH key
+ login {
+   user = var.username
+   keys = var.ssh_public_keys
+   create_password = false
+ }
+}