Add centralized immutable QuickStack deployment workflow

.gitea/scoped_workflows/quickstack-oci.yml

@@ -0,0 +1,32 @@
+name: Immutable QuickStack OCI deployment
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: quickstack-oci-${{ gitea.repository }}-${{ gitea.ref }}
+  cancel-in-progress: false
+
+jobs:
+  build_and_deploy:
+    name: Build once and deploy exact digest
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout consuming repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+
+      - name: Build and deploy declared QuickStack targets
+        uses: ./.gitea/actions/quickstack-oci
+        with:
+          config-path: .quickstack/deploy.json
+        env:
+          REGISTRY_USERNAME: ${{ secrets.REGISTRY_USERNAME }}
+          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
+          QUICKSTACK_API_TOKEN: ${{ secrets.QUICKSTACK_API_TOKEN }}
+          QUICKSTACK_BASE_URL: https://server.nuvisphere.de