Add support for adding additional containerd configs

This allow for options such as SystemdCgroup to be optionally set.

Signed-off-by: Evan Lezar <elezar@nvidia.com>

tools/container/containerd/containerd_test.go

@@ -0,0 +1,72 @@
+/**
+# Copyright 2024 NVIDIA CORPORATION
+#
+# 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 main
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestRuntimeOptions(t *testing.T) {
+	testCases := []struct {
+		description   string
+		options       options
+		expected      map[string]interface{}
+		expectedError error
+	}{
+		{
+			description: "empty is nil",
+		},
+		{
+			description: "empty json",
+			options: options{
+				runtimeConfigOverrideJSON: "{}",
+			},
+			expected:      map[string]interface{}{},
+			expectedError: nil,
+		},
+		{
+			description: "SystemdCgroup is true",
+			options: options{
+				runtimeConfigOverrideJSON: "{\"SystemdCgroup\": true}",
+			},
+			expected: map[string]interface{}{
+				"SystemdCgroup": true,
+			},
+			expectedError: nil,
+		},
+		{
+			description: "SystemdCgroup is false",
+			options: options{
+				runtimeConfigOverrideJSON: "{\"SystemdCgroup\": false}",
+			},
+			expected: map[string]interface{}{
+				"SystemdCgroup": false,
+			},
+			expectedError: nil,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.description, func(t *testing.T) {
+			runtimeOptions, err := tc.options.runtimeConfigOverride()
+			require.ErrorIs(t, tc.expectedError, err)
+			require.EqualValues(t, tc.expected, runtimeOptions)
+		})
+	}
+}