helm: add oci chart release

.github/workflows/release-helm.yaml

@@ -0,0 +1,46 @@
+---
+# yamllint disable rule:line-length
+
+name: Release Charts
+on: # yamllint disable-line rule:truthy
+  push:
+    branches:
+      - master
+    paths:
+      - 'helm/snapscheduler/**'
+
+permissions: read-all
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write # to push chart release and create a release (helm/chart-releaser-action)
+      packages: write # needed for ghcr access
+      id-token: write # needed for keyless signing
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        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: Install Helm
+        uses: azure/setup-helm@v4
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3.6.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+
+      - name: Push chart to GHCR
+        run: |
+          helm package helm/snapscheduler
+          helm push snapscheduler-*.tgz oci://ghcr.io/${GITHUB_REPOSITORY_OWNER}/charts