e2e: shared volume plugin deployment replacing init container approach

Replace the init container plugin installation with a shared PVC volume
between the CI runner and Headlamp pod. The runner builds the plugin and
copies it to the shared mount; Headlamp reads from the same volume.

- Add deployment/headlamp-e2e-values.yaml (PVC-backed shared volume)
- Add deployment/headlamp-plugins-pvc.yaml (PVC manifest)
- Add scripts/deploy-plugin-via-volume.sh (build + copy + restart)
- Remove deployment/headlamp-static-plugin-values.yaml (init container)

This is CI-only test infrastructure — ArtifactHub remains the sole
user-facing distribution channel.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

deployment/headlamp-e2e-values.yaml

@@ -0,0 +1,22 @@
+---
+# Headlamp Helm values for E2E testing with shared volume plugin deployment.
+#
+# The CI runner and Headlamp pod share a PVC so that the runner can copy
+# built plugin artifacts directly into Headlamp's plugins directory.
+# This is a CI-only mechanism — production plugin distribution uses ArtifactHub.
+
+# Point Headlamp at the shared plugins mount
+config:
+  pluginsDir: /headlamp/plugins
+
+# PVC-backed volume shared with the CI runner
+volumes:
+  - name: plugins
+    persistentVolumeClaim:
+      claimName: headlamp-plugins
+
+# Mount into the Headlamp container
+volumeMounts:
+  - name: plugins
+    mountPath: /headlamp/plugins
+    readOnly: true

deployment/headlamp-plugins-pvc.yaml

@@ -0,0 +1,14 @@
+---
+# PVC for sharing built plugin artifacts between the CI runner and Headlamp.
+# Used only in E2E test environments — not for production.
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: headlamp-plugins
+  namespace: kube-system
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 128Mi

deployment/headlamp-static-plugin-values.yaml

@@ -1,83 +0,0 @@
----
-# Custom Headlamp values for static plugin installation
-# This disables the plugin manager and uses an init container instead
-
-# Disable the plugin manager sidecar
-pluginsManager:
-  enabled: false
-
-# Use an init container to install plugins to /headlamp/static-plugins
-initContainers:
-  - name: install-plugins
-    image: node:lts-alpine
-    command:
-      - /bin/sh
-      - -c
-      - |
-        set -e
-        echo "Installing plugins to /headlamp/static-plugins..."
-
-        # Create plugins directory
-        mkdir -p /headlamp/static-plugins
-
-        # Set up npm cache
-        export NPM_CONFIG_CACHE=/tmp/npm-cache
-        export NPM_CONFIG_USERCONFIG=/tmp/npm-userconfig
-        mkdir -p /tmp/npm-cache /tmp/npm-userconfig
-
-        # Install polaris plugin
-        echo "Installing polaris plugin..."
-        cd /headlamp/static-plugins
-        npm pack headlamp-polaris-plugin@0.3.0
-        tar -xzf headlamp-polaris-plugin-0.3.0.tgz
-        mv package headlamp-polaris-plugin
-        rm headlamp-polaris-plugin-0.3.0.tgz
-
-        # Install other plugins
-        npx --yes @headlamp-k8s/plugin@latest install \
-          --source https://artifacthub.io/packages/headlamp/headlamp-plugins/headlamp_flux \
-          --folderName /headlamp/static-plugins
-
-        npx --yes @headlamp-k8s/plugin@latest install \
-          --source https://artifacthub.io/packages/headlamp/headlamp-trivy/headlamp_trivy \
-          --folderName /headlamp/static-plugins
-
-        npx --yes @headlamp-k8s/plugin@latest install \
-          --source https://artifacthub.io/packages/headlamp/headlamp-plugins/headlamp_cert-manager \
-          --folderName /headlamp/static-plugins
-
-        npx --yes @headlamp-k8s/plugin@latest install \
-          --source https://artifacthub.io/packages/headlamp/headlamp-plugins/headlamp_ai_assistant \
-          --folderName /headlamp/static-plugins
-
-        echo "All plugins installed successfully"
-        ls -la /headlamp/static-plugins
-    securityContext:
-      runAsUser: 100
-      runAsGroup: 101
-      runAsNonRoot: true
-      privileged: false
-    resources:
-      requests:
-        cpu: 100m
-        memory: 256Mi
-      limits:
-        memory: 512Mi
-    volumeMounts:
-      - name: static-plugins
-        mountPath: /headlamp/static-plugins
-
-# Configure headlamp to use static plugins
-config:
-  pluginsDir: /headlamp/static-plugins
-
-# Add volume for static plugins
-volumes:
-  - name: static-plugins
-    emptyDir: {}
-
-# Add volume mount to main container
-volumeMounts:
-  - name: static-plugins
-    mountPath: /headlamp/static-plugins
-    readOnly: true