Fix the feature

Stop waiting for connection, which requires ready container.
Instead copy data first thing.

core/testcontainers/core/generic.py

@@ -70,8 +70,8 @@ def _create_connection_url(
     def start(self) -> "DbContainer":
         self._configure()
         super().start()
-        self._connect()
         self._transfer_seed()
+        self._connect()
         return self
 
     def _configure(self) -> None:

modules/mysql/testcontainers/mysql/__init__.py

@@ -87,8 +87,7 @@ def __init__(
 
         if self.username == "root":
             self.root_password = self.password
-        if seed is not None:
-            self.seed = seed
+        self.seed = seed
 
     def _configure(self) -> None:
         self.with_env("MYSQL_ROOT_PASSWORD", self.root_password)
@@ -110,6 +109,8 @@ def get_connection_url(self) -> str:
         )
 
     def _transfer_seed(self) -> None:
+        if self.seed is None:
+            return
         src_path = Path(self.seed)
         dest_path = "/docker-entrypoint-initdb.d/"
         with BytesIO() as archive, tarfile.TarFile(fileobj=archive, mode="w") as tar: