Mount a GitHub repository onto a Runloop devbox at creation time (including private repos)

Documented steps

1. Add a code_mount entry to the `mounts` array when creating a devbox with required fields `type: "code_mount"`, `repo_name`, and `repo_owner` (GitHub user/org).
2. For private repositories, supply an optional `token` (Personal Access Token) in the mount config, e.g. Python `os.environ.get("GH_TOKEN")`; Runloop automatically configures the `GH_TOKEN` env var and Git credential cache on the devbox.
3. Optionally set `install_command` to run a post-clone setup command automatically.
4. Example: Python `devbox = await runloop.devbox.create(mounts=[{"type": "code_mount", "repo_name": "acme-website", "repo_owner": "company", "token": os.environ.get("GH_TOKEN")}])`.
5. The repository is cloned to `~/[repo_name]` on the devbox filesystem.
6. With a token configured, the `gh` CLI can be used inside the devbox for authenticated operations like opening pull requests.
7. Docs: https://docs.runloop.ai/docs/devboxes/mounts/code-mounts