Updates mysql app to follow new wild-app patterns.

apps/mysql/kustomization.yaml

@@ -0,0 +1,15 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: mysql
+labels:
+  - includeSelectors: true
+    pairs:
+      app: mysql
+      managedBy: kustomize
+      partOf: wild-cloud
+resources:
+  - namespace.yaml
+  - statefulset.yaml
+  - service.yaml
+  - service-headless.yaml
+  - configmap.yaml