Move cri base plugin to CRI runtime service

Create new plugin type for CRI runtime and image services.

Signed-off-by: Derek McGowan <derek@mcg.dev>

plugins/cri/runtime/load_test.go

@@ -0,0 +1,60 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package runtime
+
+import (
+	"encoding/json"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	criconfig "github.com/containerd/containerd/v2/pkg/cri/config"
+	"github.com/containerd/containerd/v2/pkg/oci"
+)
+
+func TestLoadBaseOCISpec(t *testing.T) {
+	spec := oci.Spec{Version: "1.0.2", Hostname: "default"}
+
+	file, err := os.CreateTemp("", "spec-test-")
+	require.NoError(t, err)
+
+	defer func() {
+		assert.NoError(t, file.Close())
+		assert.NoError(t, os.RemoveAll(file.Name()))
+	}()
+
+	err = json.NewEncoder(file).Encode(&spec)
+	assert.NoError(t, err)
+
+	config := criconfig.Config{}
+	config.Runtimes = map[string]criconfig.Runtime{
+		"runc": {BaseRuntimeSpec: file.Name()},
+	}
+
+	specs, err := loadBaseOCISpecs(&config)
+	assert.NoError(t, err)
+
+	assert.Len(t, specs, 1)
+
+	out, ok := specs[file.Name()]
+	assert.True(t, ok, "expected spec with file name %q", file.Name())
+
+	assert.Equal(t, "1.0.2", out.Version)
+	assert.Equal(t, "default", out.Hostname)
+}