Because the kubernetes plugin has a work around to specify a runAsUser when using multiple containers, this has led to an inability to copy files as needed (due to permission denied).  To get around this I have been mounting volumes.  This works if I add a secret or configmap to the Jenkins namespace manually.  But, if I want this to be part of a pipeline I would need to include these someone in the pipeline.

Like so:
pipeline {
  agent {
    kubernetes {
      yaml '''

        apiVersion: v1
        kind: ConfigMap
        metadata:
          name: values
        data:
          ldap.conf: |
            TLS_CACERT      /etc/ssl/certs/ca-certificates.crt
        —
        apiVersion: v1
        kind: Pod
        spec:
          securityContext:
            runAsUser: 1001
          volumes:
          - name: ca-bundle
            secret:
              secretName: ca-bundle
              items:
              - key: ca-bundle.crt
                path: ca-certificates.crt
          - name: ldap.conf
            configMap:
              name: values
              items:
              - key: ldap.conf
                path: ldap.conf

          containers:
          - name: openldap
            image: bitnami/openldap
            tty: true
            securityContext:
              privileged: true
            volumeMounts:
            - name: ca-bundle
              mountPath: /etc/ssl/certs
              readOnly: true
            - name: values
              mountPath: /etc/openldap/ldap.conf
              readOnly: true

If there is some other way that I can add in additional objects such as a secret or configmap as part of the pipeline please let me know, I am still fairly new to working with Jenkins.