chore(README): update docker run command in README

References the latest build image as opposed to expecting someone to pull the repo to build

README.md

@@ -28,14 +28,13 @@ curl localhost:3000/healthcheck
 
 ### Docker
 
-Build and run the container:
+Build and run the latest image:
 
 ```shell
-docker build --build-arg NODE_VERSION=$(cat .nvmrc |cut -c2-8) --build-arg NODE_VERSION_SHORT=$(cat .nvmrc |cut -c2-3) . -t arns-service
-docker run -e PORT=3000 -p 3000:3000 arns-service
+docker run -e GATEWAY_HOST=arweave.net -p 3000:3000 ghcr.io/ar-io/arns-service:latest
 ```
 
-You can run on a different port by changing the `-e PORT=3000 -p 3000:3000` to `-e PORT=4000 -p 4000:4000`, for example.
+You can run on a different port by changing the `-e PORT=3000 -p 3000:3000` to `-e PORT=4000 -p 4000:4000`, for example, or specify a `.env` file with `--env-file` flag.
 
 ## Warp