feat: GPU worker Dockerfile using CUDA base with ffmpeg NVENC support

services/worker/Dockerfile.gpu

@@ -0,0 +1,23 @@
+# GPU-accelerated worker — requires NVIDIA Container Toolkit on the host
+# Build: docker compose -f docker-compose.yml -f docker-compose.gpu.yml build worker
+#
+# Prerequisites:
+#   - NVIDIA drivers installed on host
+#   - NVIDIA Container Toolkit: https://docs.nvidia.com/datacenter/cloud-native/container-toolkit/
+#   - GPU capability in docker-compose.gpu.yml enables NVENC access
+
+FROM nvcr.io/nvidia/cuda:12.3.1-base-ubuntu22.04
+
+# Install Node.js 20 and ffmpeg (Ubuntu's ffmpeg includes h264_nvenc/hevc_nvenc)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+      curl ca-certificates ffmpeg \
+    && curl -fsSL https://deb.nodesource.com/setup_20.x | bash - \
+    && apt-get install -y --no-install-recommends nodejs \
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --omit=dev
+COPY src ./src
+
+CMD ["node", "src/index.js"]