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

+from __future__ import annotations
+
+import os
+import signal
+import subprocess
+import time
+from typing import Final
+
+import pytest
+import test_tools as tt
+
+from clive.__private.core.constants.setting_identifiers import DATA_PATH
+from clive.__private.settings import clive_prefixed_envvar
+
+
+@pytest.mark.parametrize("signal", [signal.SIGHUP, signal.SIGINT, signal.SIGQUIT, signal.SIGTERM])
+def test_close_on_signal(signal: signal.Signals) -> None:
+    # ARRANGE
+    working_directory = tt.context.get_current_directory()
+    entry_point: Final[str] = "clive"
+    envs = os.environ
+    envs[clive_prefixed_envvar(DATA_PATH)] = working_directory.as_posix()
+    beekeeper_pid = working_directory / "beekeeper" / "beekeeper.pid"
+
+    # ACT
+    process = subprocess.Popen([entry_point], env=envs, shell=True)
+
+    # Give the process some time to start and stop
+    time.sleep(1)
+    os.kill(process.pid, signal)
+    time.sleep(1)
+
+    # ASSERT
+    running = process.poll() is not None
+    assert running
+    assert not beekeeper_pid.exists()