wip: add docker push test

Signed-off-by: Magnus Kulke <[email protected]>

.github/workflows/mgns.yaml

@@ -0,0 +1,41 @@
+# (C) Copyright Confidential Containers Contributors 2023.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Daily run the e2e tests for libvirt.
+---
+name: mgns oci push test
+
+on:
+  push:
+    branches:
+    - mkulke/add-scratch-space-for-sandbox
+
+jobs:
+  mgns-oci-push-test:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout the code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Github Container Registry
+        if: ${{ startsWith(inputs.registry, 'ghcr.io') }}
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: mgns test push
+        env:
+          REGISTRY: ${{ inputs.registry }}
+        run: |
+          mkdir mgns && cd mgns
+          cat <<EOF > Dockerfile
+          FROM ubuntu:22.04
+  
+          RUN echo hello > /hello.txt
+          EOF
+          docker buildx build -t "${REGISTRY}/cloud-api-adaptor:latest-dev" --push .