doc: add instructions on how to test unstable builds on macOS

docs/general/testing/server/macos.md

@@ -0,0 +1,69 @@
+---
+uid: testing-macos
+title: macOS
+description: Test unstable builds on macOS.
+sidebar_position: 2
+---
+
+# Test unstable builds on macOS
+
+Testing unstable builds requires you to not be afraid of using the command line.
+
+Before running the unstable builds, make sure to backup your current data from the following folders:
+
+```shell
+~/.config/jellyfin/
+~/.local/share/jellyfin/
+```
+
+## Get Unstable Server
+
+Unlike the stable releases, the unstable builds for macOS do not come with a packaged installer or application. Instead, they have to be ran from the command line.
+
+The latest unstable builds for packaged jellyfin can be obtained [here](https://repo.jellyfin.org/?path=/server/macos/latest-unstable).
+
+Intel Macs should download the `AMD64` binaries.
+
+Apple Silicon Macs should download the `ARM64` binaries.
+
+There is no difference in content between the `tar.gz` and the `tar.xz` archives. They are only compressed in different formats and either one will work.
+
+## Get Jellyfin FFmpeg
+
+The unstable builds don't come with FFmpeg bundled. Instead, the binaries have to be downloaded separately.
+
+Jellyfin's custom FFmpeg is available [here](https://repo.jellyfin.org/?path=/ffmpeg/macos).
+
+Select the version corresponding to the unstable version of the server.
+
+## Prepare The Unstable Server and FFmpeg
+
+After downloading both the server and FFmpeg, extract them to a folder you like. Before running, the quarantine flag needs to be removed and an ad-hoc signature needs to be created for the binaries.
+
+Open a command line interface. You can use the `Terminal.app` come with macOS, then run following commands:
+
+```shell
+cd /path/to/jellyfin
+xattr -rd com.apple.quarantine .
+codesign -fs - --deep jellyfin
+```
+
+Similarly, the quarantine flag needs to be removed from `ffmpeg` and `ffprobe` as well. We don't need to sign them manually, as the ad-hoc signature will be created automatically on first run:
+
+```shell
+cd /path/to/jellyfin-ffmpeg
+xattr -rd com.apple.quarantine .
+```
+
+## Run The Unstable Server
+
+At this point, the binaries should be ready for testing. Run the following command in a terminal to start Jellyfin:
+
+```shell
+/path/to/jellyfin-folder/jellyfin --ffmpeg /path/to/ffmpeg-folder/ffmpeg
+```
+
+After running the command, Jellyfin should startup in the terminal window.
+
+To stop Jellyfin, press `CONTROL+C` in the terminal window, and Jellyfin will shutdown gracefully.
+Closing the terminal window will also stop Jellyfin.