Resolve "Add RabbitMQ for MessageBus triggers"

Closes #1 (closed)

\approve @ds @gislars

Dockerfile

@@ -16,6 +16,6 @@ RUN apt-get update \
     libpq-dev \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
-RUN apt-get install libpg-dev \
+RUN pg_config --help \
     && pip install pgxnclient \
     && pgxnclient install pg_amqp