docker : add libsdl2-dev for container builds (#2424)

* Added libsdl2-dev for SDL samples

Building talk-llama seems to fail here as there is no sdl.h.

* Adding libsdl2-dev for sdl.h

* Adding libsdl2-dev for sdl.h

.devops/main-cuda.Dockerfile

@@ -17,7 +17,7 @@ ENV CUDA_DOCKER_ARCH=${CUDA_DOCKER_ARCH}
 ENV GGML_CUDA=1
 
 RUN apt-get update && \
-    apt-get install -y build-essential \
+    apt-get install -y build-essential libsdl2-dev \
     && rm -rf /var/lib/apt/lists/* /var/cache/apt/archives/*
 
 # Ref: https://stackoverflow.com/a/53464012