example/test_solrcloud_additional_volume.yaml

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# Mounting Additional Volumes
#
# It is also possible to mount additional volumes to the SolrCloud (or its initContainers). Some example scenarios where you might use this would be:
#   - Custom solr plugins that rely on certain data to be present on disk
#   - Bootstrapping additional configuration for Solr via a ConfigMap
#
# Below is an example of the last scenario:

apiVersion: solr.apache.org/v1beta1
kind: SolrCloud
metadata:
  name: test
  namespace: test
spec:
  replicas: 1
  customSolrKubeOptions:
    podOptions:
      volumes:
        - source: 
            configMap:
              name: configset
              defaultMode: 0777
          name: configset
          defaultContainerMount:
            mountPath: /configset
            name: configset
      sidecarContainers:
        - name: config-loader
          image: alpine/curl:latest
          command:
            - "sh"
            - "-c"
            - "ls -la /configset"
          volumeMounts:
            - name: configset
              mountPath: /configset

# Note the `source` spec may change based on the implementation. In this case, the `configMap` spec requires field `name`.
# See volume spec in CRD: https://github.com/apache/solr-operator/blob/main/config/crd/bases/solr.apache.org_solrclouds.yaml#L6800

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: configset
  namespace: test
data:
  config.xml: |
    <?xml version="1.0" encoding="UTF-8" ?>
     <config>
      ...
     </config>