Support OpenRC in tunnel service instsall

<!-- ⚠️⚠️ Do Not Delete This! bug_report_template ⚠️⚠️ --> <!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ --> <!-- 🕮 Read our guide about submitting issues: https://github.com/microsoft/vscode/wiki/Submitting-Bugs-and-Suggestions --> <!-- 🔎 Search existing issues to avoid creating duplicates. --> <!-- 🧪 Test using the latest Insiders build to see if your issue has already been fixed: https://code.visualstudio.com/insiders/ --> <!-- 💡 Instead of creating your report here, use 'Report Issue' from the 'Help' menu in VS Code to pre-fill useful information. --> <!-- 🔧 Launch with `code --disable-extensions` to check. --> Does this issue occur when all extensions are disabled?: N/A <!-- 🪓 If you answered No above, use 'Help: Start Extension Bisect' from Command Palette to try to identify the cause. --> <!-- 📣 Issues caused by an extension need to be reported directly to the extension publisher. The 'Help > Report Issue' dialog can assist with this. --> - VS Code Version: `code-cli 1.75.0 (commit e2816fe719a4026ffa1ee0189dc89bdfdbafb164)` - OS Version: ``` > cat /etc/alpine-release 3.17.0 ``` Steps to Reproduce: 1. `scp` a copy of an already downloaded `linux arm64` `Code CLI` package from another host onto the target Alpine host system (see #173550) 2. Extract copied `tar.gz` (`tar xzvf code.tar.gz`) 3. `./code tunnel service install` This produces: ``` > code tunnel service install * * Visual Studio Code Server * * By using the software, you agree to * the Visual Studio Code Server License Terms (https://aka.ms/vscode-server-license) and * the Microsoft Privacy Statement (https://privacy.microsoft.com/en-US/privacystatement). * [2023-02-06 08:11:56] error error creating dbus session: I/O error: No such file or directory (os error 2) ``` I see the solution as using an appropriate `openrc` configuration file to properly run the `code tunnel` as an `openrc` service. Even with a proper service manager though, it looked like the …