Fix schema for env variables

Operator expects a {name,value} object, so we were unable to set envs with the existing CRD schema

Change-Id: Icf81caea3e141c56b0669e901dd1175c2b3465fe

deploy/crds/zuul-ci_v1alpha2_zuul_cr.yaml

@@ -23,6 +23,9 @@ spec:
   externalConfig:
     kubernetes:
       secretName: nodepool-kube-config
+  # env:
+  #   - name: EXAMPLE
+  #     value: example
 #
 # uncomment the following if the k8s cluster has less than 3 nodes:
 #  database:

deploy/crds/zuul-ci_v1alpha2_zuul_crd.yaml

@@ -61,8 +61,14 @@ spec:
                     storageClassName:
                       type: string
                 env:
-                  type: object
+                  type: array
-                  x-kubernetes-preserve-unknown-fields: true
+                  items:
+                    type: object
+                    properties:
+                      name:
+                        type: string
+                      value:
+                        type: string
                 scheduler:
                   type: object
                   properties: