Add ark-proxy repo to release train team

Author: Alex-Welsh

terraform/github/terraform.tfvars.json

@@ -88,6 +88,7 @@
     "ReleaseTrain": [
       ".github",
       "ARC-Installer",
+      "ark-proxy",
       "stackhpc-release-train",
       "stackhpc-release-train-clients"
     ],
@@ -347,6 +348,11 @@
         "Test deployment and reimage on OpenStack / openstack-ci (RL9)"
       ]
     },
+    "ark-proxy": {
+      "default": [
+        "validate"
+      ]
+    },
     "designate-dashboard": {
       "default": []
     },