CloudBuild中Git Builder无法与GitHub认证的问题求助

我在微服务单体仓库（Monorepo）项目中使用CloudBuild文件，通过Git builder运行bash脚本识别提交变更的目录，输出结果到文件供后续流水线使用。代码片段如下：

steps:
  - name: 'gcr.io/cloud-builders/git'
    entrypoint: /bin/bash
    args: 
    - -c
    - |
      git fetch --depth=2 origin main
      echo hello
      git  log
      git --no-pager diff --name-only HEAD^ HEAD | grep "/" | cut -d/ -f1 | sort | uniq > /workspace/diff.txt

在私有仓库运行时，git fetch --depth=2 origin main命令报错：

fatal: could not read Username for 'https://github.com': No such device or address

已确认CloudBuild代理已成功克隆仓库，但Git builder未获得与主CloudBuild代理相同的OAuth令牌，尝试过不同权限的CloudBuilder服务账号仍未解决。

解决方案 #

1. 直接使用已克隆的仓库内容 #

CloudBuild启动阶段已经完成了仓库克隆，无需在Git builder步骤中重复执行git fetch，直接操作现有仓库即可：

steps:
  - name: 'gcr.io/cloud-builders/git'
    entrypoint: /bin/bash
    args: 
    - -c
    - |
      git --no-pager diff --name-only HEAD^ HEAD | grep "/" | cut -d/ -f1 | sort | uniq > /workspace/diff.txt

2. 传递Git凭据到容器 #

如果必须执行fetch，可以通过共享卷将CloudBuild的Git凭据传递给Git builder容器：

steps:
  # 先将CloudBuild的凭据复制到共享卷
  - name: 'gcr.io/cloud-builders/git'
    entrypoint: /bin/bash
    args:
    - -c
    - |
      cp /builder/home/.git-credentials /root/.git-credentials
    volumes:
      - name: 'git-credentials'
        path: '/root/.git-credentials'
  # 使用共享卷中的凭据执行fetch和diff
  - name: 'gcr.io/cloud-builders/git'
    entrypoint: /bin/bash
    args: 
    - -c
    - |
      git fetch --depth=2 origin main
      git --no-pager diff --name-only HEAD^ HEAD | grep "/" | cut -d/ -f1 | sort | uniq > /workspace/diff.txt
    volumes:
      - name: 'git-credentials'
        path: '/root/.git-credentials'

3. 利用CloudBuild内置环境变量 #

CloudBuild提供COMMIT_SHA和PREVIOUS_COMMIT_SHA环境变量，直接用这两个变量进行diff，避免手动处理HEAD：

steps:
  - name: 'gcr.io/cloud-builders/git'
    entrypoint: /bin/bash
    args: 
    - -c
    - |
      git --no-pager diff --name-only ${PREVIOUS_COMMIT_SHA} ${COMMIT_SHA} | grep "/" | cut -d/ -f1 | sort | uniq > /workspace/diff.txt

内容的提问来源于stack exchange，提问作者Will Sutton