Use Erlang and RabbitMQ from the official RabbitMQ docker image

We do it this way because the previous approach (using erlang
and rabbitmq-server Alpine packages) was unreliable.

Sometimes with the previous approach, the version of Erlang
available via apk wouldn't match the version RabbitMQ was compiled
with, causing RabbitMQ to fail.

With this new approach, we should always have matching Erlang and
RabbitMQ, so it should all work ok.

Author: justinclift

docker/Dockerfile

@@ -1,21 +1,33 @@
 # vim:set ft=dockerfile:
-FROM alpine:3.17
+
+# We grab RabbitMQ and Erlang from the official RabbitMQ image
+FROM rabbitmq:3-alpine AS rabbit
+
+# Build our own image
+FROM alpine:3.18
 
 LABEL maintainer="Justin Clift <[email protected]>"
 
-# Install Git, Go, Memcached, Minio, OpenRC, PostgreSQL, and RabbitMQ
-RUN  \
-    apk update && \
+# Copy the RabbitMQ files we need
+COPY --from=rabbit /etc/rabbitmq /etc/rabbitmq
+COPY --from=rabbit /opt/erlang /opt/erlang
+COPY --from=rabbit /opt/openssl /opt/openssl
+COPY --from=rabbit /opt/rabbitmq /opt/rabbitmq
+COPY --from=rabbit /var/lib/rabbitmq /var/lib/rabbitmq
+COPY --from=rabbit /var/log/rabbitmq /var/log/rabbitmq
+
+# Create the rabbitmq user and group
+RUN addgroup -S rabbitmq && \
+    adduser -S -D -h /var/lib/rabbitmq -s /sbin/nologin -g "Linux User,,," -G rabbitmq rabbitmq && \
+    chown -Rh rabbitmq: /opt/rabbitmq /var/log/rabbitmq
+
+# Install Git, Go, Memcached, Minio, OpenRC, and PostgreSQL
+RUN apk update && \
     apk upgrade && \
     apk add --no-cache ca-certificates 'curl>7.61.0' file git go libc-dev make memcached minio openrc openssl openssl-dev postgresql yarn && \
-    apk add rabbitmq-server --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing/ && \
     rc-update add memcached default && \
     rc-update add minio default && \
-    rc-update add postgresql default && \
-    rc-update add rabbitmq-server default && \
-    mkdir /etc/rabbitmq && \
-    rabbitmq-plugins enable rabbitmq_management && \
-    rabbitmq-plugins enable rabbitmq_top
+    rc-update add postgresql
 
 # Create the DBHub.io OS user
 RUN addgroup dbhub && \
@@ -31,7 +43,7 @@ ENV MINIO_ROOT_PASSWORD minio123
 RUN sed -i "s/^MINIO_ROOT_USER=\"change-me\"/MINIO_ROOT_USER=\"${MINIO_ROOT_USER}\"/" /etc/conf.d/minio && \
     sed -i "s/^MINIO_ROOT_PASSWORD=\"change-me\"/MINIO_ROOT_PASSWORD=\"${MINIO_ROOT_PASSWORD}\"/" /etc/conf.d/minio
 
-# Run each of our daemon dependencies at least once to ensure they initialise ok, and populate the DBHub.io database
+# Run each of our (non RabbitMQ) daemon dependencies at least once to ensure they initialise ok, and populate the DBHub.io database
 RUN echo "openrc nonetwork" >> /usr/local/bin/init.sh && \
     echo "openrc default stop 2>&1 | grep -v 'Read-only file system'" >> /usr/local/bin/init.sh && \
     echo "createuser -U postgres -d dbhub" >> /usr/local/bin/init.sh && \
@@ -40,7 +52,6 @@ RUN echo "openrc nonetwork" >> /usr/local/bin/init.sh && \
     echo "rc-service memcached stop 2>&1 | grep -v 'Read-only file system'" >> /usr/local/bin/init.sh && \
     echo "rc-service minio stop 2>&1 | grep -v 'Read-only file system'" >> /usr/local/bin/init.sh && \
     echo "rc-service postgresql stop 2>&1 | grep -v 'Read-only file system'" >> /usr/local/bin/init.sh && \
-    echo "rc-service rabbitmq-server stop 2>&1 | grep -v 'Read-only file system'" >> /usr/local/bin/init.sh && \
     chmod +x /usr/local/bin/init.sh
 
 # Set the dependencies and DBHub.io daemons to automatically start
@@ -62,6 +73,11 @@ RUN GOBIN=/usr/local/bin go install github.com/go-delve/delve/cmd/dlv@latest
 RUN echo "echo 127.0.0.1 docker-dev.dbhub.io docker-dev >> /etc/hosts" >> /usr/local/bin/start.sh && \
     echo "openrc default" >> /usr/local/bin/start.sh && \
     echo "" >> /usr/local/bin/start.sh && \
+    echo "unset CONFIG_FILE" >> /usr/local/bin/start.sh && \
+    echo "export RABBITMQ_CONFIG_FILES=/etc/rabbitmq/conf.d" >> /usr/local/bin/start.sh && \
+    echo "export PATH=/opt/rabbitmq/sbin:/opt/erlang/bin:/opt/openssl/bin:$PATH" >> /usr/local/bin/start.sh && \
+    echo "/opt/rabbitmq/sbin/rabbitmq-server &" >> /usr/local/bin/start.sh && \
+    echo "" >> /usr/local/bin/start.sh && \
     echo "# Wait for RabbitMQ to start before launching the DBHub.io daemons" >> /usr/local/bin/start.sh && \
     echo "sleep 15" >> /usr/local/bin/start.sh && \
     echo "" >> /usr/local/bin/start.sh && \