speed up benchmark eval scheduling and docker workflow

tests/envs/test_lazy_vec_env.py

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+#!/usr/bin/env python
+
+# Copyright 2025 The HuggingFace Inc. team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from lerobot.envs.lazy_vec_env import LazyVectorEnv
+
+
+class _DummyVectorEnv:
+    def __init__(self):
+        self.marker = "ok"
+        self.closed = False
+
+    def close(self):
+        self.closed = True
+
+
+def test_lazy_vec_env_materializes_only_on_access():
+    created = []
+
+    def _make_env(fns):
+        created.append(len(fns))
+        return _DummyVectorEnv()
+
+    lazy = LazyVectorEnv(_make_env, [lambda: None, lambda: None])
+    assert created == []
+    assert lazy.num_factory_fns == 2
+
+    assert lazy.marker == "ok"
+    assert created == [2]
+
+    # Second access should re-use the same materialized env.
+    assert lazy.marker == "ok"
+    assert created == [2]
+
+
+def test_lazy_vec_env_can_rematerialize_after_close():
+    created = []
+
+    def _make_env(fns):
+        created.append(len(fns))
+        return _DummyVectorEnv()
+
+    lazy = LazyVectorEnv(_make_env, [lambda: None])
+    lazy.materialize()
+    assert created == [1]
+
+    lazy.close()
+    lazy.materialize()
+    assert created == [1, 1]
+