github: dockerfile release testing

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

.github/workflows/dockerfile-release-test.yml

@@ -0,0 +1,28 @@
+name: dockerfile-release-test
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - testing/dockerfile-test-versioning
+
+env:
+  TESTFLAGS: "-v --parallel=6 --timeout=30m"
+
+jobs:
+  test:
+    runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        ref:
+          - dockerfile/1.11.0
+        channel:
+          - mainline
+          - labs
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Test
+        run: |
+          DOCKERFILE_RELEASES=${{ matrix.channel }} TEST_SUITE_CONTEXT=https://github.com/${GITHUB_REPOSITORY}.git#${{ matrix.ref }} TESTPKGS=./frontend/dockerfile ./hack/test dockerfile