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In your web browser, browse to your repository.
Go to Settings > Actions > Runners > New Self-Hosted Runner.
It will give you a series of commands to paste into the terminal. Instead of pasting them into the terminal, do this:
Find the line that says "./config.sh --url=..."
Get the URL and the token.
Read the URL to ensure it's a specific repository, not the organization or whatever.
Run this script as root. The script installs the runner, creates the service, and launches the service as the service account. It records the URL of which repository it's working for, in the userservice account's home directory under "actions-runner-url.txt":
Code Block /root/bin/create-gitrunner.sh username GithubRepositoryURL token
Browse back to Actions > Runners, and confirm the new runner appears there, with a green Status, and Idle.