Added a select field to the EKS infrastructure form for selecting control plane versions.

api/server/handlers/infra/forms.go

@@ -408,6 +408,18 @@ tabs:
       required: true
       placeholder: my-cluster
       variable: cluster_name
+    - type: select
+      label: EKS control plane version
+      variable: cluster_version
+      settings:
+        default: 1.20
+        options:
+        - label: 1.20
+          value: 1.20
+        - label: 1.21
+          value: 1.21
+        - label: 1.22
+          value: 1.22
     - type: number-input
       label: Minimum number of EC2 instances to create in the application autoscaling group.
       variable: min_instances