Master feature flag (#815)

feat: master feature flag

Author: scaliby

src/xpk/utils/feature_flags.py

@@ -18,7 +18,12 @@
 
 
 def _get_boolean_flag(flag: str, default: bool) -> bool:
-  return os.getenv(flag, str(default)).lower() == "true"
+  experiment_value = os.getenv(flag, "").lower()
+  if experiment_value in ["true", "false"]:
+    return experiment_value == "true"
+
+  xpk_tester = os.getenv("XPK_TESTER", "").lower() == "true"
+  return xpk_tester or default
 
 
 class _FeatureFlags: