tests: Ensure the nydus-snapshotter versions are aligned

In the previous commit we added the assumption that the
nydus-snapshotter version should be the same in two different places.

Now, with this test, we ensure those will always be in sync.

Signed-off-by: Fabiano Fidêncio <ffidencio@nvidia.com>

.github/workflows/nydus-snapshotter-version-in-sync.yaml

@@ -0,0 +1,35 @@
+name: nydus-snapshotter-version-sync
+
+on:
+  pull_request:
+    types:
+      - opened
+      - edited
+      - reopened
+      - synchronize
+
+permissions: {}
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  nydus-snapshotter-version-check:
+    name: nydus-snapshotter-version-check
+    runs-on: ubuntu-22.04
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      with:
+        persist-credentials: false
+    - name: Ensure nydus-snapshotter-version is in sync inside our repo
+      run: |
+        dockerfile_version=$(grep "ARG NYDUS_SNAPSHOTTER_VERSION" tools/packaging/kata-deploy/Dockerfile | cut -f2 -d'=')
+        versions_version=$(yq ".externals.nydus-snapshotter.version | explode(.)" versions.yaml)
+        if [[ "${dockerfile_version}" != "${versions_version}" ]]; then
+          echo "nydus-snapshotter version must be the same in the following places: "
+          echo "- versions.yaml: ${versions_version}"
+          echo "- tools/packaging/kata-deploy/Dockerfile: ${dockerfile_version}"
+          exit 1
+        fi