[model] add cosmos3 reasoner to llm only inference (#33572)

Signed-off-by: joeltg <joel@reflection.ai>
Signed-off-by: Joe Rowell <joe@poolside.ai>
Co-authored-by: Dawid Majchrowski <dmajchrowski@nvidia.com>
Co-authored-by: Kedi Wu <kediw@nvidia.com>
Co-authored-by: Kedi Wu <31940276+kediwu0331@users.noreply.github.com>
Co-authored-by: Joel Gustafson <joelgustafson@protonmail.com>

docker/Dockerfile

@@ -744,6 +744,7 @@ RUN --mount=type=cache,target=/var/cache/apt,id=runtime-apt \
     ca-certificates \
     netcat-openbsd \
     curl \
+    ffmpeg \
     git \
     # Runtime libraries
     libopenmpi3 \