.. rubric:: Possible values

* Native systems: ``ubuntu``, ``windows``, ``macos``
* MSYS2: ``msys``, ``mingw32``, ``mingw64``, ``clang32``, ``clang64``, ``ucrt64``

+------+-----------+------------------------------+-----------------------------------------------------------------+
| Icon | System    | Used version                 | Comments                                                        |
+======+===========+==============================+=================================================================+
| 🪟   | Windows   | Windows Server 2025 (latest) |                                                                 |
+------+-----------+------------------------------+-----------------------------------------------------------------+
| 🐧   | Ubuntu    | Ubuntu 24.04 (LTS) (latest)  |                                                                 |
+------+-----------+------------------------------+-----------------------------------------------------------------+
| 🍎   | macOS     | macOS Ventura 13 (latest)    | While this marked latest, macOS Ventura 13 is already provided. |
+------+-----------+------------------------------+-----------------------------------------------------------------+
| 🍏   | macOS-arm | macOS Sonoma 14 (latest)     | While this marked latest, macOS Ventura 13 is already provided. |
+------+-----------+------------------------------+-----------------------------------------------------------------+
| 🟪   | MSYS      |                              |                                                                 |
+------+-----------+------------------------------+-----------------------------------------------------------------+
| ⬛   | MinGW32   |                              |                                                                 |
+------+-----------+------------------------------+-----------------------------------------------------------------+
| 🟦   | MinGW64   |                              |                                                                 |
+------+-----------+------------------------------+-----------------------------------------------------------------+
| 🟫   | Clang32   |                              |                                                                 |
+------+-----------+------------------------------+-----------------------------------------------------------------+
| 🟧   | Clang64   |                              |                                                                 |
+------+-----------+------------------------------+-----------------------------------------------------------------+
| 🟨   | UCRT64    |                              |                                                                 |
+------+-----------+------------------------------+-----------------------------------------------------------------+

Source: `Images provided by GitHub <https://github.com/actions/runner-images>`__