ci: release-please + helm push to GHCR OCI

.github/workflows/release.yml

@@ -0,0 +1,55 @@
+name: release
+
+on:
+  push:
+    branches: [main]
+
+permissions:
+  contents: write
+  packages: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    outputs:
+      release_created: ${{ steps.release.outputs.release_created }}
+      tag_name: ${{ steps.release.outputs.tag_name }}
+    steps:
+      - uses: googleapis/release-please-action@v5
+        id: release
+        with:
+          config-file: release-please-config.json
+          manifest-file: .release-please-manifest.json
+
+  helm-push:
+    needs: release-please
+    if: ${{ needs.release-please.outputs.release_created }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          ref: ${{ needs.release-please.outputs.tag_name }}
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v4
+        with:
+          version: v3.18.4
+
+      - name: Login to GHCR
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | helm registry login ghcr.io -u ${{ github.actor }} --password-stdin
+
+      - name: Helm package + push to GHCR OCI
+        run: |
+          set -euo pipefail
+          tag="${{ needs.release-please.outputs.tag_name }}"
+          version="${tag#v}"
+          # release-please updated Chart.yaml's `version` to match the tag;
+          # double-check before packaging so we do not push a mismatched chart.
+          chart_version=$(grep -E '^version: ' Chart.yaml | awk '{print $2}')
+          if [ "$chart_version" != "$version" ]; then
+            echo "::error::Chart.yaml version ($chart_version) does not match tag ($version)"
+            exit 1
+          fi
+          helm package .
+          helm push "platform-vcluster-template-${version}.tgz" oci://ghcr.io/groundsgg/charts

.release-please-manifest.json

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+{".":"0.0.0"}

release-please-config.json

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+{
+  "release-type": "helm",
+  "include-component-in-tag": false,
+  "bump-minor-pre-major": true,
+  "bump-patch-for-minor-pre-major": true,
+  "packages": {
+    ".": {
+      "package-name": "platform-vcluster-template"
+    }
+  }
+}