Document DRA driver installation on OpenShift

demo/clusters/openshift/README.md

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+# Running on Red Hat OpenShift
+
+This document covers OpenShift-specific requirements for deploying the driver.
+
+## OpenShift Version
+
+Ensure you have OpenShift 4.19 or later.
+For installation methods, see [OpenShift documentation](https://docs.redhat.com/en/documentation/openshift_container_platform/latest/html/installation_overview/ocp-installation-overview).
+
+## `TechPreviewNoUpgrade` Feature Set
+
+On OpenShift 4.20 (Kubernetes 1.33) and earlier, enable DRA through the `TechPreviewNoUpgrade` feature set (includes the `DynamicResourceAllocation` feature gate), either during installation or post-install.
+See [Enabling features using FeatureGates](https://docs.redhat.com/en/documentation/openshift_container_platform/latest/html/nodes/working-with-clusters#nodes-cluster-enabling-features-about_nodes-cluster-enabling).
+
+**WARNING:** Enabling `TechPreviewNoUpgrade` disables future cluster upgrades and is irreversible.
+
+## Scheduler Profile
+
+On OpenShift 4.19, enable DRA in the cluster scheduler:
+
+```console
+$ oc patch --type merge -p '{"spec":{"profile": "HighNodeUtilization", "profileCustomizations": {"dynamicResourceAllocation": "Enabled"}}}' scheduler cluster
+```
+
+## NVIDIA GPU Operator
+
+Install the NVIDIA GPU Operator for OpenShift.
+Ensure you have version 25.10.0 or later.
+For installation steps, see [NVIDIA GPU Operator on Red Hat OpenShift Container Platform](https://docs.nvidia.com/datacenter/cloud-native/openshift/latest/index.html).
+
+Ensure CDI (Container Device Interface) mode is enabled in the `ClusterPolicy`:
+
+```yaml
+cdi:
+  enabled: true
+```
+
+## NVIDIA GPU Driver Location
+
+On OpenShift, the location of the driver provided by the GPU operator differs from the default.
+Set the following value when installing the Helm chart:
+
+```yaml
+nvidiaDriverRoot: /run/nvidia/driver
+```
+
+Example using `--set`:
+
+```console
+$ helm install nvidia-dra-driver-gpu nvidia/nvidia-dra-driver-gpu \
+    <...>
+    --set nvidiaDriverRoot=/run/nvidia/driver
+```