tekton v0.38.2离线安装

1、安装包准备

安装包直接下载：
https://download.csdn.net/download/xiongmao0304/86931818
或者在可以科学上网的机器上执行以下步骤
1、下载tekton安装文件和tekton dashboard安装文件
https://storage.googleapis.com/tekton-releases/pipeline/previous/v0.38.2/release.yaml
https://storage.googleapis.com/tekton-releases/dashboard/previous/v0.28.0/tekton-dashboard-release.yaml
2、修改tekton-release.yaml，去掉镜像的sha256值，并给busybox加上了标签

gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/webhook:v0.38.2
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/controller:v0.38.2
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/kubeconfigwriter:v0.38.2
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/git-init:v0.38.2
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/entrypoint:v0.38.2
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/nop:v0.38.2
gcr.io/tekton-releases/gith