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>

scripts/deploy-plugin-via-volume.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+# deploy-plugin-via-volume.sh
+#
+# Copies the built plugin into the shared PVC so Headlamp picks it up.
+# The PVC must already be mounted on the CI runner at PLUGIN_VOLUME_PATH.
+#
+# Usage:
+#   scripts/deploy-plugin-via-volume.sh [plugin-volume-path]
+#
+# Environment:
+#   PLUGIN_VOLUME_PATH  — mount point of the shared PVC (default: /mnt/headlamp-plugins)
+#   HEADLAMP_NAMESPACE  — namespace where Headlamp runs (default: kube-system)
+#   HEADLAMP_DEPLOY     — Headlamp deployment name (default: headlamp)
+set -euo pipefail
+
+REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+PLUGIN_VOLUME_PATH="${1:-${PLUGIN_VOLUME_PATH:-/mnt/headlamp-plugins}}"
+HEADLAMP_NAMESPACE="${HEADLAMP_NAMESPACE:-kube-system}"
+HEADLAMP_DEPLOY="${HEADLAMP_DEPLOY:-headlamp}"
+
+# The deployed directory name must match the plugin's registered name.
+# PR #56 aligns registerPluginSettings to "polaris"; the directory must match.
+PLUGIN_DIR_NAME="polaris"
+DIST_DIR="$REPO_ROOT/dist"
+
+if [ ! -d "$DIST_DIR" ]; then
+  echo "ERROR: dist/ not found. Run 'npm run build' first." >&2
+  exit 1
+fi
+
+echo "Deploying plugin to shared volume..."
+echo "  Source:      $DIST_DIR"
+echo "  Destination: $PLUGIN_VOLUME_PATH/$PLUGIN_DIR_NAME"
+
+# Clean any previous version and copy fresh build
+rm -rf "${PLUGIN_VOLUME_PATH:?}/${PLUGIN_DIR_NAME}"
+mkdir -p "$PLUGIN_VOLUME_PATH/$PLUGIN_DIR_NAME"
+cp -a "$DIST_DIR"/. "$PLUGIN_VOLUME_PATH/$PLUGIN_DIR_NAME/"
+cp "$REPO_ROOT/package.json" "$PLUGIN_VOLUME_PATH/$PLUGIN_DIR_NAME/"
+
+echo "Plugin files deployed:"
+ls -la "$PLUGIN_VOLUME_PATH/$PLUGIN_DIR_NAME/"
+
+# Restart Headlamp to pick up the new plugin
+echo "Restarting Headlamp deployment to load plugin..."
+kubectl rollout restart "deployment/$HEADLAMP_DEPLOY" -n "$HEADLAMP_NAMESPACE"
+kubectl rollout status "deployment/$HEADLAMP_DEPLOY" -n "$HEADLAMP_NAMESPACE" --timeout=120s
+
+echo "Plugin deployed successfully."