No Sound for Cameras on aarch64
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# Bug Report

### Describe the Bug
Sounds in camera/doorbell feed doesn't work with aarch64 Raspbian 11 (Debian 11 Bullseye), while Homebridge is installed in Docker. I looked at Dockerfile and it should be installing FFMPEG fine, so something else looks to be going wrong.

### To Reproduce
- Installed latest Raspbian 11 (Debian 11 Bullseye) on RPi
- Homebridge runs in Docker using https://github.com/oznu/docker-homebridge
- When trying to view camera/doorbell, getting error `[Ring] Streaming video only - ffmpeg was not found. See https://github.com/dgreif/ring/wiki/FFmpeg for details.` Sound is not working, though the camera itself does. Guide on that link mentioned supporting aarch64 but it doesn't work.
- https://github.com/oznu/docker-homebridge/blob/master/Dockerfile#L12-L20 seems to be installing FFMPEG into the image and I confirmed that `uname -m` will return `aarch64`, so I should be getting an image with FFMPEG but sounds still doesn't work

### Expected behavior
Camera feed and sound work as expected.

### Screenshots/Logs
`[Ring] Streaming video only - ffmpeg was not found. See https://github.com/dgreif/ring/wiki/FFmpeg for details.`
Nothing else in logs that is out of normal.

### Homebridge Ring Config
Vanilla config.

### Environment
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 - OS: Raspbian 11, 64-bit
 - Node.js: latest
 - NPM: latest
 - homebridge-ring: 10.0.0-beta4
 - homebridge: 1.4.1
