[Docker] Wait until elasticsearch is up for tests

docker-compose.yml

@@ -44,7 +44,7 @@ services:
       - redis
       - memcached
       - elastic
-    entrypoint: ["bundle", "exec", "rails", "test"]
+    entrypoint: ["docker/test_runner.sh"]
     profiles:
       - test
 

docker/test_runner.sh

@@ -0,0 +1,6 @@
+#! /bin/sh
+set -e
+echo "Waiting for elastic to come up"
+timeout 20 sh -c 'until nc -z elastic 9200; do sleep 1; done'
+
+bundle exec rails test "$@"