fix(plume): Appsettings via kustomize

values/plume/kustomize/base/kustomization.yaml

@@ -0,0 +1,4 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - _manifest.yaml

values/plume/kustomize/staging/kustomization.yaml

@@ -0,0 +1,8 @@
+generatorOptions:
+  disableNameSuffixHash: true
+configMapGenerator:
+- name: staging-plume-appsettings
+  files:
+    - appsettings.json
+resources:
+  - ../base