Ka9q radiod with sdrplay support docker image

[TheSkorm]

To enable sdrplay support we pass a volume with SDRplay_RSP_API-Linux-3.15.2.run in it. The entrypoint automatically extracts it. I think the sdrplay lib is only loaded if sdrplay device is used so we could modify this to work as a general purpose ka9q docker image with some changes to the entrypoint.

-v /Users/mwheeler/Downloads/sdrplay/:/sdrplay -v /Users/mwheeler/Downloads/config:/config

At the moment it assumes the config file is at /config/sdrplay.conf. I don't have a device so can't test much further.

KA9Q Multichannel SDR main.c last modified Thu Feb 20 05:07:28 2025
Copyright 2025, Phil Karn, KA9Q. May be used under the terms of the GNU Public License
Loading config file /config/sdrplayd.conf
Loading presets file /usr/local/share/ka9q-radio/presets.conf
Dynamically loading sdrplay hardware driver from /usr/local/lib/ka9q-radio/sdrplay.so
No SDRplay RSP devices found
device setup returned -1