Update to containerd 1.6.8

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

vendor/github.com/alexellis/arkade/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 Alex Ellis
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/alexellis/arkade/pkg/env/env.go

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+// Copyright (c) arkade author(s) 2022. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+package env
+
+import (
+	"log"
+	"os"
+	"path"
+	"strings"
+
+	execute "github.com/alexellis/go-execute/pkg/v1"
+)
+
+// GetClientArch returns a pair of arch and os
+func GetClientArch() (arch string, os string) {
+	task := execute.ExecTask{Command: "uname", Args: []string{"-m"}, StreamStdio: false}
+	res, err := task.Execute()
+	if err != nil {
+		log.Println(err)
+	}
+
+	archResult := strings.TrimSpace(res.Stdout)
+
+	taskOS := execute.ExecTask{Command: "uname", Args: []string{"-s"}, StreamStdio: false}
+	resOS, errOS := taskOS.Execute()
+	if errOS != nil {
+		log.Println(errOS)
+	}
+
+	osResult := strings.TrimSpace(resOS.Stdout)
+
+	return archResult, osResult
+}
+
+func LocalBinary(name, subdir string) string {
+	home := os.Getenv("HOME")
+	val := path.Join(home, ".arkade/bin/")
+	if len(subdir) > 0 {
+		val = path.Join(val, subdir)
+	}
+
+	return path.Join(val, name)
+}