Add OCI chart releaser workflow (#776)

Author: afritzler

.github/workflows/release-chart.yaml

@@ -0,0 +1,61 @@
+name: Release Helm Charts
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'charts/gardener-extension-provider-ironcore/**'
+  workflow_dispatch:
+
+jobs:
+  helm-chart:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v4
+        with:
+          version: v3.16.2
+
+      - name: Determine chart version
+        id: chart_version
+        run: |
+          if [[ "${{ github.event_name }}" == "push" && "${{ github.ref }}" == "refs/heads/main" ]]; then
+            # Use SHA for main branch
+            CHART_VERSION="0.0.0-$(echo ${{ github.sha }} | cut -c1-7)"
+          elif [[ "${{ github.event_name }}" == "push" && "${{ github.ref }}" =~ ^refs/tags/v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+            # Use tag version (strip 'v' prefix)
+            CHART_VERSION="${GITHUB_REF#refs/tags/v}"
+          else
+            # Use PR SHA for dry run
+            CHART_VERSION="0.0.0-$(echo ${{ github.sha }} | cut -c1-7)"
+          fi
+          echo "version=$CHART_VERSION" >> $GITHUB_OUTPUT
+
+      - name: Log in to GitHub Container Registry
+        run: |
+          echo "${{ secrets.GITHUB_TOKEN }}" | helm registry login ghcr.io -u ${{ github.actor }} --password-stdin
+
+      - name: Package provider Helm chart
+        run: |
+          helm package charts/gardener-extension-provider-ironcore --version ${{ steps.chart_version.outputs.version }}
+
+      - name: Push provider Helm chart to GHCR
+        run: |
+          helm push gardener-extension-provider-ironcore-${{ steps.chart_version.outputs.version }}.tgz oci://ghcr.io/${{ github.repository_owner }}/charts
+
+      - name: Package admission Helm chart
+        run: |
+          helm package charts/gardener-extension-admission-ironcore --version ${{ steps.chart_version.outputs.version }}
+
+      - name: Push admission Helm chart to GHCR
+        run: |
+          helm push gardener-extension-admission-ironcore-${{ steps.chart_version.outputs.version }}.tgz oci://ghcr.io/${{ github.repository_owner }}/charts

README.md

@@ -54,3 +54,9 @@ Please find further resources about out project here:
 * [Extensibility API documentation](https://github.com/gardener/gardener/tree/master/docs/extensions)
 * [Gardener Extensions Golang library](https://godoc.org/github.com/gardener/gardener/extensions/pkg)
 * [Gardener API Reference](https://gardener.cloud/api-reference/)
+
+## Licensing
+
+Copyright 2025 SAP SE or an SAP affiliate company and IronCore contributors. Please see our [LICENSE](LICENSE) for
+copyright and license information. Detailed information including third-party components and their licensing/copyright
+information is available [via the REUSE tool](https://api.reuse.software/info/github.com/ironcore-dev/gardener-extension-provider-ironcore).