Add cmd_stop configuration to better support docker (#35)

Add `cmd_stop` to model configuration to run a command instead of sending a SIGTERM to shutdown a process before swapping.

config.example.yaml

@@ -53,6 +53,21 @@ models:
       --ctx-size 8192
       --reranking
 
+  # EXPERIMENTAL! Docker Support
+  # see:
+  #  - https://github.com/mostlygeek/llama-swap/pull/40
+  #  - https://github.com/mostlygeek/llama-swap/issues/35
+  "dockertest":
+    proxy: "http://127.0.0.1:9790"
+
+    # use this to reliably stop named containers
+    cmd_stop: docker stop -t 2 dockertest
+
+    cmd: >
+      docker run --name dockertest
+      --init --rm -p 9790:8080 -v /mnt/nvme/models:/models
+      ghcr.io/ggerganov/llama.cpp:server
+      --model '/models/Qwen2.5-Coder-0.5B-Instruct-Q4_K_M.gguf'
 
   "simple":
     # example of setting environment variables