Dockerfile: single-line model-download RUNs (ACR dep-scanner compatibility)

ACR Tasks' Dockerfile dependency scanner fails on backslash line-continuations
inside a quoted python -c string; collapse to single lines. Functionally
identical; normal docker build (HF Spaces) was unaffected.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -38,18 +38,15 @@ RUN pip install --no-cache-dir --break-system-packages -r requirements.txt
 #   https://github.com/Dao-AILab/flash-attention/releases
 # e.g.  RUN pip install <wheel-url>  --no-build-isolation
 
-# Pre-download ASR model into the image (no persistent storage available on HF Spaces)
+# Pre-download ASR model into the image (no persistent storage available on HF Spaces).
+# NOTE: single-line python -c on purpose — ACR's Dockerfile dependency scanner
+# chokes on backslash line-continuations inside a quoted python string.
 RUN mkdir -p /app/model_cache /app/torch_cache && \
-    python -c "\
-from huggingface_hub import snapshot_download; \
-snapshot_download('Qwen/Qwen3-ASR-1.7B', cache_dir='/app/model_cache')" \
-    && echo "ASR model pre-downloaded"
+    python -c "from huggingface_hub import snapshot_download; snapshot_download('Qwen/Qwen3-ASR-1.7B', cache_dir='/app/model_cache')" && \
+    echo "ASR model pre-downloaded"
 
 # Pre-download Silero VAD model
-RUN python -c "\
-import torch; \
-torch.hub.load('snakers4/silero-vad', 'silero_vad', trust_repo=True); \
-print('Silero VAD cached')" || echo "VAD pre-download failed, will retry at runtime"
+RUN python -c "import torch; torch.hub.load('snakers4/silero-vad', 'silero_vad', trust_repo=True); print('Silero VAD cached')" || echo "VAD pre-download failed, will retry at runtime"
 
 # Copy application code
 COPY . /app