use HOSTNAME for default otl container name

Author: Artur Shiriev

lite_bootstrap/instruments/opentelemetry_instrument.py

@@ -1,4 +1,5 @@
 import dataclasses
+import os
 import typing
 
 from lite_bootstrap import import_checker
@@ -25,7 +26,7 @@ class InstrumentorWithParams:
 @dataclasses.dataclass(kw_only=True, frozen=True)
 class OpentelemetryConfig(BaseConfig):
     opentelemetry_service_name: str | None = None
-    opentelemetry_container_name: str | None = None
+    opentelemetry_container_name: str | None = dataclasses.field(default_factory=lambda: os.environ.get("HOSTNAME") or None)
     opentelemetry_endpoint: str | None = None
     opentelemetry_namespace: str | None = None
     opentelemetry_insecure: bool = True