Add Portworx CSI driver for Pure Storage FlashArray

- Deploy Portworx Operator + CSI driver via ArgoCD
- Support both iSCSI block and NFS file storage from FlashArray
- Integrate with 1Password External Secrets for FlashArray credentials
- Include comprehensive deployment documentation and validation script
- Storage classes: pure-block (iSCSI) and pure-file (NFS)
- Talos Linux compatible with iSCSI/multipath configuration

cluster/platform/portworx-csi/storageclass-file.yaml

@@ -0,0 +1,56 @@
+# ------------------------------------------------------------------------------
+# StorageClass: pure-file
+# Provisioner: pxd.portworx.com (Portworx CSI)
+# Backend: Pure Storage FlashArray File Services (NFS)
+#
+# Use case: Shared file storage for applications requiring RWX access
+# Features:
+#   - NFS-based file storage from FlashArray File Services
+#   - Dynamic provisioning of NFS exports
+#   - RWX (ReadWriteMany) access mode support
+#   - Delete reclaim policy
+#
+# Prerequisites:
+#   - FlashArray File Services enabled
+#   - NFS policy configured on FlashArray
+#   - NFSEndPoint specified in pure.json
+#
+# Parameters:
+#   - backend: "pure-file" (uses FlashArray File Services)
+#   - export_options: NFS export options
+# ------------------------------------------------------------------------------
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: pure-file
+  annotations:
+    storageclass.kubernetes.io/is-default-class: "false"
+provisioner: pxd.portworx.com
+parameters:
+  # Backend type - FlashArray File Services (NFS)
+  backend: "pure-file"
+  
+  # NFS export options
+  export_options: "*(rw,no_root_squash)"
+  
+  # Filesystem type (NFS is the protocol, not a local filesystem)
+  # This parameter may not be applicable for pure-file backend
+  
+  # Priority for placement
+  priority_io: "medium"
+
+# Reclaim policy
+reclaimPolicy: Delete
+
+# Volume binding mode
+volumeBindingMode: Immediate
+
+# Allow volume expansion
+allowVolumeExpansion: true
+
+# Mount options for NFS
+mountOptions:
+  - nfsvers=4.1
+  - hard
+  - timeo=600
+  - retrans=3