ci: Move run-containerd-stability to free runner

Removes the Docker installation step as that's preinstalled on the free
runner:

https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2204-Readme.md#tools

Signed-off-by: Aurélien Bombo <abombo@microsoft.com>

.github/workflows/basic-ci-amd64.yaml

@@ -57,14 +57,12 @@ jobs:
         run: bash tests/integration/cri-containerd/gha-run.sh run
 
   run-containerd-stability:
-    # TODO: Transition to free runner (see #9940).
-    if: false
     strategy:
       fail-fast: false
       matrix:
         containerd_version: ['lts', 'active']
         vmm: ['clh', 'cloud-hypervisor', 'dragonball', 'qemu', 'stratovirt']
-    runs-on: garm-ubuntu-2204-smaller
+    runs-on: ubuntu-22.04
     env:
       CONTAINERD_VERSION: ${{ matrix.containerd_version }}
       GOPATH: ${{ github.workspace }}

tests/stability/gha-run.sh

@@ -29,7 +29,6 @@ function install_dependencies() {
 	sudo apt-get -y install "${system_deps[@]}"
 
 	ensure_yq
-	install_docker
 	check_ctr_images "${IMAGE}" "${DOCKERFILE}"
 }