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/sample-inventory/cluster.tfvars

@@ -0,0 +1,56 @@
+# See: https://developers.upcloud.com/1.3/5-zones/
+zone     = "fi-hel1"
+username = "ubuntu"
+
+inventory_file = "inventory.ini"
+
+#  A valid domain name, e.g. host.example.com. The maximum length is 128 characters.
+hostname = "example.com"
+
+#  Set the operating system using UUID or exact name
+template_name = "Ubuntu Server 20.04 LTS (Focal Fossa)"
+ssh_public_keys = [
+  # Put your public SSH key here
+  "ssh-rsa I-did-not-read-the-docs",
+  "ssh-rsa I-did-not-read-the-docs 2",
+]
+
+check list of available plan https://developers.upcloud.com/1.3/7-plans/
+machines = {
+  "master-0" : {
+    "node_type" : "master",
+    #number of cpu cores
+    "cpu" : "2",
+    #memory size in MB
+    "mem" : "4096"
+    # The size of the storage in GB
+    "disk_size" : 250
+  },
+  "worker-0" : {
+    "node_type" : "worker",
+    #number of cpu cores
+    "cpu" : "2",
+    #memory size in MB
+    "mem" : "4096"
+    # The size of the storage in GB
+    "disk_size" : 250
+  },
+  "worker-1" : {
+    "node_type" : "worker",
+    #number of cpu cores
+    "cpu" : "2",
+    #memory size in MB
+    "mem" : "4096"
+    # The size of the storage in GB
+    "disk_size" : 250
+  },
+  "worker-2" : {
+    "node_type" : "worker",
+    #number of cpu cores
+    "cpu" : "2",
+    #memory size in MB
+    "mem" : "4096"
+    # The size of the storage in GB
+    "disk_size" : 250
+  }
+}

contrib/terraform/upcloud/sample-inventory/group_vars

@@ -0,0 +1 @@
+../../../../inventory/sample/group_vars/