fix(ci): pre-create libero config in Dockerfile to bypass stdin prompt

libero/__init__.py calls input() when ~/.libero/config.yaml is missing.
We write the config at image build time (without importing libero) so
the prompt never fires at runtime. Also trigger CI on pyproject.toml changes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/benchmark_tests.yml

@@ -33,6 +33,7 @@ on:
       - "src/lerobot/scripts/lerobot_eval.py"
       - "docker/Dockerfile.benchmark.*"
       - ".github/workflows/benchmark_tests.yml"
+      - "pyproject.toml"
 
   pull_request:
     branches:
@@ -42,6 +43,7 @@ on:
       - "src/lerobot/scripts/lerobot_eval.py"
       - "docker/Dockerfile.benchmark.*"
       - ".github/workflows/benchmark_tests.yml"
+      - "pyproject.toml"
 
 permissions:
   contents: read
@@ -103,7 +105,6 @@ jobs:
             --shm-size=4g \
             -e HF_HOME=/tmp/hf \
             -e HF_USER_TOKEN="${HF_USER_TOKEN}" \
-            -e LIBERO_DATA_FOLDER=/tmp/libero_data \
             lerobot-benchmark-libero:ci \
             bash -c "
               hf auth login --token \"\$HF_USER_TOKEN\" --add-to-git-credential 2>/dev/null || true