Install Theodolite volumes using Helm

Add support (and pre-configuration) for:

• HostPath volumes
• local volumes
• Google Cloud Platform
• Oracle Cloud Infrastructure

Closes #114 (closed)

helm/preconfigs/oci.yaml

+operator:
+  resultsVolume:
+    storageClassName: "oci-bv"
+    size: 50Gi # minimal size in OCI
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