Add list of image tags to README

Signed-off-by: Samuel Monson <[email protected]>

Author: sjmonson

README.md

@@ -71,6 +71,15 @@ podman run \
 
 Replace `latest` with `stable` for the newest tagged release or set a specific release if desired.
 
+#### Available Tags
+
+| Tags | Notes |
+| ---- | ----- |
+| `nightly` | Built from `main` every night |
+| [`v0.3.0`](https://github.com/vllm-project/guidellm/pkgs/container/guidellm/507504396?tag=v0.3.0) `stable` `latest` | - |
+| [`v0.2.1`](https://github.com/vllm-project/guidellm/pkgs/container/guidellm/489918552?tag=v0.2.1) | - |
+| `pr-*` | Development builds (DO NOT USE IN PRODUCTION) |
+
 ### Quick Start
 
 #### 1. Start an OpenAI Compatible Server (vLLM)