chore: Add Helm charts workflows

.github/chart-releaser-config.yaml

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+release-name-template: "{{ .Name }}-helm-chart-{{ .Version }}"

.github/workflows/release-charts.yaml

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+name: Release Charts
+
+on:
+  workflow_dispatch:
+
+  # Ref: https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#release
+  release:
+    types: [ published ]
+
+jobs:
+  release:
+    # depending on default permission settings for your org (contents being read-only or read-write for workloads), you will have to add permissions
+    # see: https://docs.github.com/en/actions/security-guides/automatic-token-authentication#modifying-the-permissions-for-the-github_token
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Configure Git
+        run: |
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "[email protected]"
+
+      - name: Install Helm
+        uses: azure/setup-helm@v3
+        with:
+          token: "${{ secrets.GITHUB_TOKEN }}"
+
+      - name: Run chart-releaser
+        uses: helm/[email protected]
+        with:
+          charts_dir: charts
+          packages_with_index: true
+          pages_branch: helm-registry
+          config: .github/chart-releaser-config.yaml
+        env:
+          CR_OWNER: "$GITHUB_REPOSITORY_OWNER"
+          CR_GIT_REPO: tekton-exporter
+          CR_SKIP_EXISTING: true
+          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"