Update readme.md

Author: macbre

readme.md

@@ -134,5 +134,6 @@ Refer to `run-docker.sh` script on how to run this container and properly mount
 Building an image:
 
 ```
+docker pull ghcr.io/macbre/nginx-http3:latest
 DOCKER_BUILDKIT=1 docker build . -t macbre/nginx --cache-from=ghcr.io/macbre/nginx-http3:latest --progress=plain
 ```