Give test containers more time to start

We're seeing intermittent transient failures in CI (e.g. [1]),
hopefully this will help.

[1] https://github.com/stackhpc/azimuth-llm/actions/runs/18780593105/job/53586017528

Author: sd109

web-apps/test-images.sh

@@ -69,7 +69,7 @@ test() {
         docker run --network $DOCKER_NET_NAME -d --name $1-app $IMAGE
 
         # Give the app time to start
-        sleep 3
+        sleep 10
 
         log "Running tests"
         docker run --network $DOCKER_NET_NAME --rm \