Ensure the ssl-reverse-proxy is available

docker/test.sh

@@ -5,6 +5,10 @@ TESTSUITE_IMAGE="registry.git.autistici.org/noblogs/testsuite:main"
 # Run a ssl-reverse-proxy in the background.
 podman run -d --expose 8443 --rm --env PROXY_DOMAIN=noblogs.org --env PROXY_BACKEND_ADDR=localhost:8080 --network=host registry.git.autistici.org/pipelines/images/test/ssl-reverse-proxy:main
 
+# Give the ssl-reverse-proxy a little time to start.
+# (It would be better to probe the port)
+sleep 3
+
 # Run the test suite using Podman, in the foreground.
 # Mount a local temporary directory to hold artifacts.
 mkdir -p test-artifacts