Add "rabbitmq"

rabbitmq/Dockerfile

@@ -0,0 +1,5 @@
+FROM rabbitmq
+
+COPY docker-healthcheck /usr/local/bin/
+
+HEALTHCHECK CMD ["docker-healthcheck"]

rabbitmq/docker-healthcheck

@@ -0,0 +1,13 @@
+#!/bin/bash
+set -eo pipefail
+
+host="$(hostname --short || echo 'localhost')"
+export RABBITMQ_NODENAME="${RABBITMQ_NODENAME:-"rabbit@$host"}"
+
+if rabbitmqctl status; then
+	exit 0
+fi
+
+# If the probe returns 2 ("starting") when the container has already moved out of the "starting" state then it is treated as "unhealthy" instead.
+# https://github.com/docker/docker/blob/dcc65376bac8e73bb5930fce4cddc2350bb7baa2/docs/reference/builder.md#healthcheck
+exit 2