feat(longhorn): Add longhorn provisioner using HelmEngine

packages/longhorn/c6o.yaml

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+name: Longhorn
+appId: longhorn
+
+icon: icon.svg
+description: |
+  Longhorn is 100% open source software. Project source code is spread across a number of repos:
+
+  * Longhorn Engine -- Core controller/replica logic https://github.com/longhorn/longhorn-engine
+  * Longhorn Instance Manager -- Controller/replica instance lifecycle management https://github.com/longhorn/longhorn-instance-manager
+  * Longhorn Share Manager -- NFS provisioner that exposes Longhorn volumes as ReadWriteMany volumes. https://github.com/longhorn/longhorn-share-manager
+  * Longhorn Manager -- Longhorn orchestration, includes CSI driver for Kubernetes https://github.com/longhorn/longhorn-manager
+  * Longhorn UI -- Dashboard https://github.com/longhorn/longhorn-ui
+
+summary:
+  Longhorn is a distributed block storage system for Kubernetes.
+category: analytics
+keywords:
+  - Storage
+  - Longhorn
+  - Open Source
+
+repo: https://github.com/longhorn/longhorn
+license: https://github.com/longhorn/longhorn/blob/master/LICENSE
+support: https://github.com/longhorn/longhorn/issues
+
+provisioner:
+  repo: https://github.com/c6o/provisioners
+  support: https://github.com/c6o/provisioners/issues
+
+editions:
+  - edition-preview.yaml
+  - edition-stable.yaml

packages/longhorn/edition-preview.yaml

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+name: preview
+status: public
+spec:
+  routes:
+    - type: http
+      targetService: longhorn-frontend
+  provisioner:
+    package: '@provisioner/helmengine'
+    tag-prefix: helmengine
+    image: dummyvalue # Required by current version of HelmEngine
+
+    namespace: longhorn-system
+    clusterAdmin: true
+
+    chart: longhorn
+    repo: https://charts.longhorn.io
+
+    configs:
+      defaultSettings:
+        # Allow replicas on same node
+        replicaSoftAntiAffinity: false
+
+        # Only have 1 replica by default
+        defaultReplicaCount: 1
+
+        # Allow way over provisioning
+        storageOverProvisioningPercentage: 5000
+
+      service:
+        ui:
+          type: NodePort
+
+  marina:
+    launch:
+      type: inline
+      popUp: true
+      private: true

packages/longhorn/edition-stable.yaml

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+name: stable
+status: public
+spec:
+  routes:
+    - type: http
+      targetService: longhorn-frontend
+  provisioner:
+    package: '@provisioner/helmengine'
+    tag-prefix: helmengine
+    image: dummyvalue # Required by current version of HelmEngine
+
+    namespace: longhorn-system
+    clusterAdmin: true
+
+    chart: longhorn
+    repo: https://charts.longhorn.io
+
+    configs:
+      defaultSettings:
+        # Allow replicas on same node
+        replicaSoftAntiAffinity: false
+
+      service:
+        ui:
+          type: NodePort
+
+  marina:
+    launch:
+      type: inline
+      popUp: true
+      private: true