How can I upload the Drupal code from the Marketplace install to a remote git repo?

You can follow the steps below to install git and get your Drupal installed uploaded to a remote git repo:

1. Connect to your Linode as the root user either via SSH (recommended) or the Lish Console in Cloud Manager.
2. Install git on your Linode by running:
   • apt update && apt install git -y
3. Configure at the very least your username and email that matches what you're using on GitHub/GitLab/other by following the steps here.
4. Change to the directory Drupal is installed and initial a local git repo by running:
   • cd /var/www/drupal && git init
5. Create the repo on GitHub/GitLab/other, configure the remote repos locally, and push the files up. While the guide I included below if from Github, the same steps also apply to GitLab or any other remote repository setup:
   • Adding an existing project to GitHub using the command line

This should get your Drupal code uploaded to a remote repository so you can begin working on it from other locations.