argo-workflow.yaml

apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
metadata:
  name: my-app-batch
  namespace: appns
spec:
  volumes:
    - name: all-configs
      configMap:
        name: my-app-batch-config
 templates:
 - name: my-app-batch
   container:
     image: dockerhub.io/nice/image
     envFrom:
       configMapRef:
         name: my-app-batch-config
     volumeMounts:
       - name: all-configs
         subPath: config.properties
         mountPath: ~/config.properties
       - name: all-configs
         subPath: secrets.properties
         mountPath: ~/secrets.properties
  - name: nightly
    dag:
      tasks:
        - name: do-my-job
          template: my-app-batch
          arguments: 
            ...
            ...
        - name: finalize-my-job
          template: my-app-batch
          dependencies: [do-my-job]
          arguments: 
            ...
            ...

kustomization.yaml

...
configMapGenerator:
  - name: my-app-batch-config
    namespace: appns
    files:
      - config/config.properties
      - config/secrets.properties

Used to discuss https://stackoverflow.com/q/66647466/1160106