Resolve "Add RabbitMQ for MessageBus triggers"

Closes #1 (closed)

\approve @ds @gislars

Dockerfile

@@ -4,14 +4,16 @@ RUN apt-get update \
   && for POSTGIS_VERSION in 3; do \
     DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y \
     postgresql-contrib \
+    postgresql-server-dev-$PG_MAJOR \
     postgresql-$PG_MAJOR-postgis-$POSTGIS_VERSION \
     postgresql-$PG_MAJOR-postgis-$POSTGIS_VERSION-scripts \
     build-essential \
     python3-pip \
     python-dev \
-    python-setuptools; \
+    python-setuptools \
+    libpq-dev; \
     done \
-  && apt-get clean \
-  && rm -rf /var/lib/apt/lists/*
-RUN pip install pgxnclient && echo $PG_CONFIG
-RUN pgxnclient install pg_amqp
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+RUN pip install pgxnclient \
+    && pgxnclient install pg_amqp