feat: update the release pipeline with helm publish

.github/workflows/helm.yml

@@ -0,0 +1,37 @@
+name: Publish Helm Chart
+on:
+  workflow_call:
+    inputs:
+      version:
+        required: true
+        type: string
+    secrets:
+      GITHUB_TOKEN:
+        required: true
+
+jobs:
+  publish-helm:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v4
+
+      - name: Package Helm chart
+        run: |
+          mkdir -p ./helm-packages
+          helm package docker/helm \
+            --version ${{ inputs.version }} \
+            --app-version ${{ inputs.version }} \
+            --destination ./helm-packages
+
+      - name: Authenticate to GitHub Packages
+        run: |
+          echo "${{ secrets.GITHUB_TOKEN }}" | helm registry login ghcr.io -u ${{ github.actor }} --password-stdin
+
+      - name: Push Helm chart to GitHub Packages (OCI)
+        run: |
+          helm push ./helm-packages/portabase-${{ inputs.version }}.tgz oci://ghcr.io/${{ github.repository }}/charts