Install jq for wait-for-es.sh

Author: oalders

Dockerfile

@@ -9,7 +9,7 @@ WORKDIR /metacpan-api
 # size of the images.
 RUN mkdir /CPAN \
     && apt-get update \
-    && apt-get install -y --no-install-recommends rsync=3.1.3-6 \
+    && apt-get install -y --no-install-recommends rsync=3.1.3-6 jq \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/* \
     && cpm install --global \