Add a debug logging flag to the service.

This makes it possible to change logging levels from the configuration.

This commit also replaces the double `logging.basicConfig` calls of the
original code; `basicConfig` only has an effect the first time
it's called.

src/main.py

@@ -494,8 +494,10 @@ async def main() -> None:
     security_protocol = os.environ["SECURITY_PROTOCOL"]
 
     # Logging config
-    logging.basicConfig(stream=sys.stdout, level=logging.INFO)
-    logging.basicConfig(stream=sys.stderr, level=logging.WARNING)
+    if os.environ.get("DEBUG_LOGS") == "true":
+        logging.basicConfig(sys.stdout, level=logging.DEBUG)
+    else:
+        logging.basicConfig(stream=sys.stdout, level=logging.INFO)
 
     conf = yaml.safe_load(Path(instrument_config_file).read_text())
     instruments = {inst: InstrumentConfig(conf, inst) for inst in supported_instruments}