ci: Add a very basic docker sanity test

Let's add a very basic sanity test to check that we can spawn a
containers using docker + Kata Containers.

This will ensure that, at least, we don't regress to the point where
this feature doesn't work at all.

For now we're running this test against Cloud Hypervisor and QEMU only,
due to an already reported issue with dragonball:
https://github.com/kata-containers/kata-containers/issues/7912

In the future, we should also test all the VMMs with devmapper, but
that's for a follow-up PR after this test is working as expected.

Fixes: #7910

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>
(cherry picked from commit 348b8644d6)

.github/workflows/ci.yaml

@@ -73,6 +73,14 @@ jobs:
           platforms: linux/amd64, linux/s390x
           file: tests/integration/kubernetes/runtimeclass_workloads/confidential/unencrypted/Dockerfile
 
+  run-docker-tests-on-garm:
+    needs: publish-kata-deploy-payload-amd64
+    uses: ./.github/workflows/run-docker-tests-on-garm.yaml
+    with:
+      tarball-suffix: -${{ inputs.tag }}
+      commit-hash: ${{ inputs.commit-hash }}
+      target-branch: ${{ inputs.target-branch }}
+
   run-kata-deploy-tests-on-aks:
     needs: publish-kata-deploy-payload-amd64
     uses: ./.github/workflows/run-kata-deploy-tests-on-aks.yaml

.github/workflows/run-docker-tests-on-garm.yaml

@@ -0,0 +1,56 @@
+name: CI | Run docker integration tests
+on:
+  workflow_call:
+    inputs:
+      tarball-suffix:
+        required: false
+        type: string
+      commit-hash:
+        required: false
+        type: string
+      target-branch:
+        required: false
+        type: string
+        default: ""
+
+jobs:
+  run-docker-tests:
+    strategy:
+      # We can set this to true whenever we're 100% sure that
+      # all the tests are not flaky, otherwise we'll fail them
+      # all due to a single flaky instance.
+      fail-fast: false
+      matrix:
+        vmm:
+          - clh
+          - qemu
+    runs-on: garm-ubuntu-2304
+    env:
+      KATA_HYPERVISOR: ${{ matrix.vmm }}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          ref: ${{ inputs.commit-hash }}
+          fetch-depth: 0
+
+      - name: Rebase atop of the latest target branch
+        run: |
+          ./tests/git-helper.sh "rebase-atop-of-the-latest-target-branch"
+        env:
+          TARGET_BRANCH: ${{ inputs.target-branch }}
+
+      - name: Install dependencies
+        run: bash tests/integration/docker/gha-run.sh install-dependencies
+
+      - name: get-kata-tarball
+        uses: actions/download-artifact@v3
+        with:
+          name: kata-static-tarball-amd64${{ inputs.tarball-suffix }}
+          path: kata-artifacts
+
+      - name: Install kata
+        run: bash tests/integration/docker/gha-run.sh install-kata kata-artifacts
+
+      - name: Run docker smoke test
+        timeout-minutes: 5
+        run: bash tests/integration/docker/gha-run.sh run