Fix improper reading of .testcontainers.properties

The environment variables were not overridden from the .testcontainers.properties file for ryuk variables.
This causes the properties file to never actually be used.
This commit detects the environment variable, and if unspecified falls back to the properties file, and if not specifed, defaults to false

Author: laundry-96

core/testcontainers/core/config.py

@@ -11,6 +11,7 @@
 
 import docker
 
+ENABLE_FLAGS = ("yes", "true", "t", "y", "1")
 
 class ConnectionMode(Enum):
     bridge_ip = "bridge_ip"
@@ -52,7 +53,7 @@ def get_bool_env(name: str) -> bool:
     Defaults to False.
     """
     value = environ.get(name, "")
-    return value.lower() in ("yes", "true", "t", "y", "1")
+    return value.lower() in ENABLE_FLAGS
 
 
 TC_FILE = ".testcontainers.properties"
@@ -96,11 +97,19 @@ def read_tc_properties() -> dict[str, str]:
 
 @dataclass
 class TestcontainersConfiguration:
+
+    def _render_bool(self, env_name: str, prop_name: str) -> bool:
+        env_val = environ.get(env_name, None)
+        if env_val is not None:
+            return env_val.lower() in ENABLE_FLAGS
+        prop_val = self.tc_properties.get(prop_name, None)
+        if prop_val is not None:
+            return prop_val.lower() in ENABLE_FLAGS
+        return False
+
     max_tries: int = int(environ.get("TC_MAX_TRIES", "120"))
     sleep_time: float = float(environ.get("TC_POOLING_INTERVAL", "1"))
     ryuk_image: str = environ.get("RYUK_CONTAINER_IMAGE", "testcontainers/ryuk:0.8.1")
-    ryuk_privileged: bool = get_bool_env("TESTCONTAINERS_RYUK_PRIVILEGED")
-    ryuk_disabled: bool = get_bool_env("TESTCONTAINERS_RYUK_DISABLED")
     _ryuk_docker_socket: str = ""
     ryuk_reconnection_timeout: str = environ.get("RYUK_RECONNECTION_TIMEOUT", "10s")
     tc_properties: dict[str, str] = field(default_factory=read_tc_properties)
@@ -129,6 +138,14 @@ def docker_auth_config(self, value: str) -> None:
     def tc_properties_get_tc_host(self) -> Union[str, None]:
         return self.tc_properties.get("tc.host")
 
+    @property
+    def ryuk_privileged(self) -> bool:
+        return self._render_bool("TESTCONTAINERS_RYUK_PRIVILEGED", "ryuk.container.privileged")
+
+    @property
+    def ryuk_disabled(self) -> bool:
+        return self._render_bool("TESTCONTAINERS_RYUK_DISABLED", "ryuk.disabled")
+
     @property
     def timeout(self) -> float:
         return self.max_tries * self.sleep_time