Working Longhorn Example (#1264)

## Description
Add to Longhorn to Zarf Examples 

## Related Issue

Relates to #854 as
longhorn will be used as the backing storage for this ZarfInitPackage

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [x] Other (security config, docs update, etc)

## Checklist before merging

- [x] Test, docs, adr added or updated as needed
- [x] [Contributor Guide
Steps](https://github.com/defenseunicorns/zarf/blob/main/CONTRIBUTING.md#developer-workflow)
followed

examples/longhorn/README.md

@@ -0,0 +1,49 @@
+# Longhorn
+
+This example shows how you how to deploy [Longhorn](longhorn.io) using Zarf
+
+Before deploying Longhorn make sure your nodes are configured with the [Longhorn Installation Requirements](https://longhorn.io/docs/1.4.0/deploy/install/#installation-requirements).
+
+You will need [open-iscsi](https://longhorn.io/docs/1.4.0/deploy/install/#installing-open-iscsi) installed.
+
+If you wish to support RWX access modes you'll need to install an [NFSv4 client](https://longhorn.io/docs/1.4.0/deploy/install/#installing-nfsv4-client) on each node.
+
+If you're working with K3s, there is extra setup required see [Longhorn CSI on K3s](https://longhorn.io/docs/1.4.0/advanced-resources/os-distro-specific/csi-on-k3s/).
+
+The values file from this example was pulled using the directions at [Customizing Default Settings](https://longhorn.io/docs/1.4.0/advanced-resources/deploy/customizing-default-settings/#using-helm) as the path for kubelet needs to be set for K3s as per [Longhorn CSI on K3s](https://longhorn.io/docs/1.4.0/advanced-resources/os-distro-specific/csi-on-k3s/)
+
+You do not need to use the values file and can remove it from the Zarf package configuration if you're not using K3s and don't need that variable set.
+
+:::info
+
+To view the example source code, select the `Edit this page` link below the article and select the parent folder.
+
+:::
+
+```
+components:
+  - name: longhorn
+    required: true
+    description: "Deploy Longhorn into a Kubernetes cluster.  https://longhorn.io"
+    charts:
+      - name: longhorn
+        url:  https://charts.longhorn.io
+        version: 1.4.0
+        namespace: longhorn-system
+        valuesFiles:
+        - "values.yaml"
+    images:
+      - longhornio/csi-attacher:v3.4.0
+      - longhornio/csi-provisioner:v2.1.2
+      - longhornio/csi-resizer:v1.3.0
+      - longhornio/csi-snapshotter:v5.0.1
+      - longhornio/csi-node-driver-registrar:v2.5.0
+      - longhornio/livenessprobe:v2.8.0
+      - longhornio/backing-image-manager:v1.4.0
+      - longhornio/longhorn-engine:v1.4.0
+      - longhornio/longhorn-instance-manager:v1.4.0
+      - longhornio/longhorn-manager:v1.4.0
+      - longhornio/longhorn-share-manager:v1.4.0
+      - longhornio/longhorn-ui:v1.4.0
+      - longhornio/support-bundle-kit:v0.0.17
+```

examples/longhorn/connect.yaml

@@ -0,0 +1,17 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: zarf-connect-longhorn-ui
+  labels:
+    # Enables "zarf connect longhorn-ui"
+    zarf.dev/connect-name: longhorn-ui
+  annotations:
+    zarf.dev/connect-description: "Connect to the Longhorn User Interface"
+spec:
+  ports:
+  - name: http
+    port: 80
+    protocol: TCP
+    targetPort: http
+  selector:
+    app: longhorn-ui