msobczyk/handle signals in docker entrypoint

handle signals in docker entrypoint, handle exit in start_clive script (close container on terminal close), closes issue #274 (closed)

tests/functional/test_signals.py

@@ -48,4 +48,4 @@ async def test_close_on_signal(signal_number: signal.Signals) -> None:
 
         # ASSERT
         await wait_for(lambda: not beekeeper_pidfile.exists(), "Beekeeper did not close")
-        await wait_for(lambda: process.returncode is not None, "Clive tui process is still running")
+        await wait_for(lambda: process.returncode == 0, "Clive tui process is still running")