This tool does not install correctly as root user.

[CraigChamberlain]

In order access large media from a task runner, that may only run root, I have to install the netlify cli and the nlm plugin.

Original error can be reproduced via the following:

#On host
docker pull node:latest
docker run --rm  -it node  "/bin/sh"

#In container
SECRET_NETLIFY_AUTH_TOKEN="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh | bash && apt-get install -y git-lfs
npm install netlify-cli -g
netlify plugins:install netlify-lm-plugin
netlify lm:install

# netlify lm:setup
  ✔ Checking Git version [2.11.0]
  ✔ Checking Git LFS version [2.12.0]
  ✔ Checking Git LFS filters
  ✖ Installing Netlify's Git Credential Helper for Linux
    → Unable to detect SHELL type, make sure the variable is defined in your environment
    Configuring Git to use Netlify's Git Credential Helper
Error: Unable to detect SHELL type, make sure the variable is defined in your environment
    at shellVariables (/root/.local/share/netlify-cli/node_modules/netlify-lm-plugin/lib/install.js:232:15)
    at setupUnixPath (/root/.local/share/netlify-cli/node_modules/netlify-lm-plugin/lib/install.js:138:23)
    at Task.task (/root/.local/share/netlify-cli/node_modules/netlify-lm-plugin/lib/install.js:74:19)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:93:5) {
  context: [Object: null prototype] {}
}

Installing the helper via package manager:

#On host
docker pull node:latest
docker run --rm  -it node  "/bin/sh"

#In container
SECRET_NETLIFY_AUTH_TOKEN="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh | bash && apt-get install -y git-lfs
npm install netlify-cli -g
netlify plugins:install netlify-lm-plugin
PACKAGE="git-credential-netlify-linux-amd64.deb"
curl -L -o $PACKAGE https://github.com/netlify/netlify-credential-helper/releases/download/v0.1.9/git-credential-netlify-linux-amd64.deb
dpkg -i $PACKAGE

netlify lm:install
...
✖ Configuring Git to use Netlify's Git Credential Helper
    → ENOENT: no such file or directory, open '/root/.netlify/helper/git-config'
Error: ENOENT: no such file or directory, open '/root/.netlify/helper/git-config'
    at Object.openSync (fs.js:474:3)
    at Object.writeFileSync (fs.js:1436:35)
    at configureGitConfig (/root/.local/share/netlify-cli/node_modules/netlify-lm-plugin/lib/install.js:212:8)
    at processTicksAndRejections (internal/process/task_queues.js:93:5) {
  errno: -2,
  syscall: 'open',
  code: 'ENOENT',
  path: '/root/.netlify/helper/git-config',
  context: [Object: null prototype] {}
}