gha: test: timeout with kill and verbosely for foreground test

Author: rpardini

.github/workflows/test.yaml

@@ -44,7 +44,7 @@ jobs:
 
       - name: Start foreground instance for first-contact sanity checking
         run: |
-          timeout 30 docker run --rm --name docker_registry_proxy \
+          timeout --signal=9 --verbose 30 docker run --rm --name docker_registry_proxy \
             -p 0.0.0.0:3128:3128 -e ENABLE_MANIFEST_CACHE=false \
             -v $(pwd)/docker_mirror_cache:/docker_mirror_cache \
             -v $(pwd)/docker_mirror_certs:/ca \