Rename dArkOS proxy process to survive game-end killall python3 cleanup

[chrishaw]

Summary

• dArkOS's EmulationStation game-end hook runs sudo killall python3 on every game exit (confirmed via journalctl), which matches the proxy service by kernel process name since it runs as python3 -m raofflineproxy.main run-service.
• Rename the process via prctl(PR_SET_NAME, ...) so it's no longer swept up by that cleanup command. Service discovery (discover_service_pids()) is unaffected since it matches on /proc/pid/cmdline, not comm.

Test plan

• Confirmed on-device: ps -o pid,comm,args shows comm=raofflineproxy after the fix (previously python3)
• Confirmed the proxy process survives launching and exiting a game on dArkOS, where it previously got killed every time

[chrishaw]

Disclosure: had AI help on this. Confirmed this works on R36S running dArkOSen-R36S

[misantronic]

I will additionally add some github actions to automate test-runs for PRs

[misantronic]

ctypes doesn't raise on a non-zero return value, so this except never catches an actual prctl() failure (only missing-symbol/load errors). The warning log added for the earlier comment still won't fire on a real syscall failure.

ret = libc.prctl(PR_SET_NAME, name.encode("utf-8"), 0, 0, 0)
if ret != 0:
    errno = ctypes.get_errno()
    logging.getLogger("raofflineproxy").warning(
        "Failed to rename process via prctl (errno=%s); comm name stays %r", errno, name
    )

Also, logging.getLogger("raofflineproxy") is now called in two places in this file, worth pulling into a module-level logger = logging.getLogger("raofflineproxy") and reusing it.