feat: Add official Helm chart for Kubernetes deployment

.github/workflows/helm-lint-test.yaml

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+name: Lint and Test Helm Chart
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - '**'
+
+jobs:
+  lint-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v4.3.0
+        with:
+          version: v3.12.0
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.12
+
+      - name: Set up chart-testing
+        uses: helm/chart-testing-action@v2.7.0
+
+      - name: Run chart-testing (lint)
+        run: ct lint --config helm/ct.yaml
+
+      - name: Create kind cluster
+        uses: helm/kind-action@v1.8.0
+
+      - name: Run chart-testing (install)
+        run: ct install --config helm/ct.yaml

.github/workflows/helm-release-oci.yaml

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+name: Release Helm Chart
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  packages: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Configure Git
+        run: |
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v4.3.0
+        with:
+          version: v3.12.0
+
+      - name: Add dependency chart repos
+        run: |
+          helm repo add bitnami https://charts.bitnami.com/bitnami
+
+      - name: Run chart-releaser
+        uses: helm/chart-releaser-action@v1.5.0
+        with:
+          charts_dir: helm
+          config: helm/cr.yaml
+        env:
+          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          CR_SKIP_EXISTING: "true"
+
+      - name: Login to GHCR
+        uses: docker/login-action@v3.6.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Push charts to GHCR
+        run: |
+          for pkg in .cr-release-packages/*.tgz; do
+            if [ -f "${pkg}" ]; then
+              helm push "${pkg}" "oci://ghcr.io/${GITHUB_REPOSITORY_OWNER}/helm-charts"
+            fi
+          done

helm/Chart.yaml

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+apiVersion: v2
+name: open-notebook
+description:  An Open Source implementation of Notebook LM with more flexibility and features
+type: application
+version: 1.0.0
+appVersion: "0.0.1"
+keywords:
+  - notebook
+  - notebooklm
+  - knowledge-management
+  - surrealdb
+home: https://github.com/lfnovo/open-notebook
+sources:
+  - https://github.com/lfnovo/open-notebook
+maintainers:
+  - name: lfnovo
+    url: https://github.com/lfnovo
+  - name: thuanpham582002
+    url: https://github.com/thuanpham582002
+annotations:
+  category: Analytics
+  licenses: MIT
+
+dependencies:
+  - name: common
+    repository: oci://registry-1.docker.io/bitnamicharts
+    version: 2.x.x