Splunk deployment to configure another splunk instance started by the Splunk operator (Example: add user)

splunk-configurator.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: splunk-configurator
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: splunk-configurator
  replicas: 1
  template:
    metadata:
      labels:
        app.kubernetes.io/name: splunk-configurator
    spec:
      containers:
        - name: splunk-configurator
          image: splunk/splunk:8.2.8
          command: ["sudo", "-E", "/bin/sh", "-c"]
          env:
            - name: URI
              value: "https://splunk-my-server-standalone-service:8089"
          args:
            - SPLUNK_START_ARGS=--accept-license SPLUNK_PASSWORD=changeme /sbin/entrypoint.sh start-and-exit;
              while true;
              do CRED=admin:$(cat /mnt/splunk-secrets/password);
              /opt/splunk/bin/splunk add user rest -password test -role rest -auth ${CRED} -uri ${URI};
              sleep 60;
              done;
          volumeMounts:
            - mountPath: /mnt/splunk-secrets
              name: mnt-splunk-secrets
      volumes:
        - name: mnt-splunk-secrets
          secret:
            secretName: splunk-default-secret

Now I understand. I will get in touch with you in case we need any professional help. Thank you, @marcusschiesser.