Move dockerfiles into their own directory (#14549)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

docs/source/deployment/docker.md

@@ -61,11 +61,11 @@ RUN uv pip install --system git+https://github.com/huggingface/transformers.git
 
 ## Building vLLM's Docker Image from Source
 
-You can build and run vLLM from source via the provided <gh-file:Dockerfile>. To build vLLM:
+You can build and run vLLM from source via the provided <gh-file:docker/Dockerfile>. To build vLLM:
 
 ```console
 # optionally specifies: --build-arg max_jobs=8 --build-arg nvcc_threads=2
-DOCKER_BUILDKIT=1 docker build . --target vllm-openai --tag vllm/vllm-openai
+DOCKER_BUILDKIT=1 docker build . --target vllm-openai --tag vllm/vllm-openai --file docker/Dockerfile
 ```
 
 :::{note}
@@ -92,6 +92,7 @@ Keep an eye on memory usage with parallel jobs as it can be substantial (see exa
 # Example of building on Nvidia GH200 server. (Memory usage: ~15GB, Build time: ~1475s / ~25 min, Image size: 6.93GB)
 $ python3 use_existing_torch.py
 $ DOCKER_BUILDKIT=1 docker build . \
+  --file docker/Dockerfile \
   --target vllm-openai \
   --platform "linux/arm64" \
   -t vllm/vllm-gh200-openai:latest \