test: register docker worker with containerd snapshotter

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.github/workflows/build.yml

@@ -66,6 +66,7 @@ jobs:
       matrix:
         worker:
           - docker
+          - docker\+containerd  # same as docker, but with containerd snapshotter
           - docker-container
           - remote
         pkg:
@@ -101,8 +102,8 @@ jobs:
           export TEST_REPORT_SUFFIX=-${{ github.job }}-$(echo "${{ matrix.pkg }}-${{ matrix.skip-integration-tests }}-${{ matrix.worker }}" | tr -dc '[:alnum:]-\n\r' | tr '[:upper:]' '[:lower:]')
           ./hack/test
         env:
-          TEST_DOCKERD: "${{ (matrix.worker == 'docker' || matrix.worker == 'docker-container') && '1' || '0' }}"
-          TESTFLAGS: "${{ (matrix.worker == 'docker') && env.TESTFLAGS_DOCKER || env.TESTFLAGS }} --run=//worker=${{ matrix.worker }}$"
+          TEST_DOCKERD: "${{ startsWith(matrix.worker, 'docker') && '1' || '0' }}"
+          TESTFLAGS: "${{ (matrix.worker == 'docker' || matrix.worker == 'docker\\+containerd') && env.TESTFLAGS_DOCKER || env.TESTFLAGS }} --run=//worker=${{ matrix.worker }}$"
           TESTPKGS: "${{ matrix.pkg }}"
           SKIP_INTEGRATION_TESTS: "${{ matrix.skip-integration-tests }}"
       -

tests/workers/docker.go

@@ -14,10 +14,15 @@ func InitDockerWorker() {
 	integration.Register(&dockerWorker{
 		id: "docker",
 	})
+	integration.Register(&dockerWorker{
+		id:                    "docker+containerd",
+		containerdSnapshotter: true,
+	})
 }
 
 type dockerWorker struct {
-	id string
+	id                    string
+	containerdSnapshotter bool
 }
 
 func (c dockerWorker) Name() string {
@@ -30,7 +35,8 @@ func (c dockerWorker) Rootless() bool {
 
 func (c dockerWorker) New(ctx context.Context, cfg *integration.BackendConfig) (b integration.Backend, cl func() error, err error) {
 	moby := integration.Moby{
-		ID: c.id,
+		ID:                    c.id,
+		ContainerdSnapshotter: c.containerdSnapshotter,
 	}
 	bk, bkclose, err := moby.New(ctx, cfg)
 	if err != nil {