Generate ConfigMaps with layered environment-specific configuration

configmaps.yaml

#@ load("@ytt:data", "data")
#@ load("@ytt:overlay", "overlay")

#@ for app_name in dir(data.values.configmaps):

#! first, instantiate a ConfigMap for the app with empty data...
---
apiVersion: v1
kind: ConfigMap
metadata:
  labels:
    label1: value1
  name: #@ app_name
data: {}

#! then, for each environment, generate an overlay that merges the configuration...
#@   for env in ["all-envs", "dev"]:
#@     if hasattr(data.values.configmaps[app_name], env):
#@overlay/match by=overlay.subset({"kind": "ConfigMap", "metadata": {"name": app_name}})
---
#@overlay/match-child-defaults missing_ok=True
data: #@ data.values.configmaps[app_name][env]
#@     end
#@   end
#@ end

schema.yaml

#@data/values-schema
---
configmaps:
  service1:
    all-envs:
      PVC: "false"
      ENDPOINT: http://internal-api:8080/api/v1/scan
      PATH: /test1
    dev:
      DB_HOST: 192.168.1.1
      DB_USER: service1_dev
  service2:
    dev:
      DB_HOST: 192.168.1.2
      DB_USER: service2_dev