Migrate to containerd 1.54

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

vendor/github.com/alexellis/go-execute/pkg/v1/exec.go

@@ -16,6 +16,10 @@ type ExecTask struct {
 	Env     []string
 	Cwd     string
 
+	// Stdin connect a reader to stdin for the command
+	// being executed.
+	Stdin io.Reader
+
 	// StreamStdio prints stdout and stderr directly to os.Stdout/err as
 	// the command runs.
 	StreamStdio bool
@@ -86,6 +90,9 @@ func (et ExecTask) Execute() (ExecResult, error) {
 			}
 		}
 	}
+	if et.Stdin != nil {
+		cmd.Stdin = et.Stdin
+	}
 
 	stdoutBuff := bytes.Buffer{}
 	stderrBuff := bytes.Buffer{}

vendor/github.com/alexellis/k3sup/LICENSE

@@ -1,6 +1,9 @@
 MIT License
 
-Copyright (c) 2019 Alex Ellis
+Copyright (c) 2019-2020 Alex Ellis
+Copyright (c) 2020 k3sup author(s)
+
+Exclusions: assets, images and logos.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal