Configure rancher to drain a nodes before launching an upgrade

If not, the pods are abruptly killed.

Related to infra/sysadm-environment#4688

proxmox/terraform/admin/cluster-admin.tf

@@ -10,6 +10,13 @@ resource "rancher2_cluster" "cluster-admin" {
     ingress {
       provider = "none"
     }
+    upgrade_strategy {
+      drain = true
+      drain_input {
+        delete_local_data = true
+        timeout = 300
+      }
+    }
  }
 }
 

proxmox/terraform/production/cluster-archive-production.tf

@@ -14,6 +14,13 @@ resource "rancher2_cluster" "archive-production" {
     ingress {
       provider = "none"
     }
+    upgrade_strategy {
+      drain = true
+      drain_input {
+        delete_local_data = true
+        timeout = 300
+      }
+    }
   }
 }
 

proxmox/terraform/staging/cluster-archive-staging.tf

@@ -18,6 +18,13 @@ resource "rancher2_cluster" "archive-staging" {
         }
       }
     }
+    upgrade_strategy {
+      drain = true
+      drain_input {
+        delete_local_data = true
+        timeout = 300
+      }
+    }
   }
 }