Add a new dockerfile and associated files, to build from a source tarball, instead of installing a built and published Alpine APK package.

Signed-off-by: Jonathan Hanson <jonathan@jonathan-hanson.org>

docker/from_dist/Dockerfile

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+FROM alpine:latest AS build
+
+# A released dist version, like "1.2.3"
+ARG VERSION
+RUN test -n "${VERSION}"
+
+RUN apk --no-cache add \
+      build-base \
+      libressl-dev \
+      c-ares-dev \
+      curl \
+      util-linux-dev \
+      libwebsockets-dev \
+      libxslt \
+      python2
+
+# This build procedure is based on:
+# https://github.com/alpinelinux/aports/blob/master/main/mosquitto/APKBUILD
+#
+# If this step fails, double check the version build-arg and make sure its
+# a valid published tarball at https://mosquitto.org/files/source/
+RUN mkdir -p /build /install && \
+    curl -SL https://mosquitto.org/files/source/mosquitto-${VERSION}.tar.gz \
+      | tar --strip=1 -xzC /build && \
+    make -C /build \
+      WITH_MEMORY_TRACKING=no \
+      WITH_WEBSOCKETS=yes \
+      WITH_SRV=yes \
+      WITH_TLS_PSK=no \
+      WITH_ADNS=no \
+      prefix=/usr \
+      binary && \
+    make -C /build \
+      prefix=/usr \
+      DESTDIR="/install" \
+      install && \
+    mv /install/etc/mosquitto/mosquitto.conf.example /install/etc/mosquitto/mosquitto.conf && \
+    sed -i -e 's/#log_dest stderr/log_dest syslog/' /install/etc/mosquitto/mosquitto.conf
+
+
+# Single-layer image for the mosquitto distribution
+FROM alpine:latest
+LABEL maintainer="Jonathan Hanson <jonathan@jonathan-hanson.org>"
+LABEL description="Eclipse Mosquitto MQTT Broker"
+
+# Install the run-time dependencies
+RUN apk --no-cache add \
+      busybox \
+      libcrypto1.0 \
+      libssl1.0 \
+      libuuid \
+      libwebsockets \
+      musl
+
+# Copy over the built install from the earlier image layer
+COPY --from=build /install /
+
+# Set up the mosquitto directories and the mosquitto user
+RUN addgroup -S mosquitto 2>/dev/null && \
+    adduser -S -D -H -h /var/empty -s /sbin/nologin -G mosquitto -g mosquitto mosquitto 2>/dev/null && \
+    mkdir -p /mosquitto/config /mosquitto/data /mosquitto/log && \
+    cp /etc/mosquitto/mosquitto.conf /mosquitto/config && \
+    chown -R mosquitto:mosquitto /mosquitto
+
+VOLUME ["/mosquitto/config", "/mosquitto/data", "/mosquitto/log"]
+
+# Set up the entry point script and default command
+COPY docker-entrypoint.sh /
+ENTRYPOINT ["/docker-entrypoint.sh"]
+CMD ["/usr/sbin/mosquitto", "-c", "/mosquitto/config/mosquitto.conf"]

docker/from_dist/README.md

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+# Eclipse Mosquitto Docker Image
+Containers built with this Dockerfile build as source from published tarballs.
+
+## Mount Points
+Three docker volumes have been created in the image to be used for configuration, persistent storage and logs.
+```
+/mosquitto/config
+/mosquitto/data
+/mosquitto/log
+```
+
+## Configuration
+When creating a container from the image, the default configuration values are used.
+To use a custom configuration file, mount a **local** configuration file to `/mosquitto/config/mosquitto.conf`
+```
+docker run -it -p 1883:1883 -p 9001:9001 -v <absolute-path-to-configuration-file>:/mosquitto/config/mosquitto.conf eclipse-mosquitto:<version>
+```
+
+Configuration can be changed to:
+
+* persist data to `/mosquitto/data`
+* log to `/mosquitto/log/mosquitto.log`
+
+i.e. add the following to `mosquitto.conf`:
+```
+persistence true
+persistence_location /mosquitto/data/
+
+log_dest file /mosquitto/log/mosquitto.log
+```
+
+**Note**: For any volume used, the data will be persistent between containers.
+
+## Build
+Build and tag the docker image for a specific version:
+```
+docker build -t eclipse-mosquitto:<version> --build-arg VERSION="<version>" .
+```
+
+## Run
+Run a container using the new image:
+```
+docker run -it -p 1883:1883 -p 9001:9001 -v <path-to-configuration-file>:/mosquitto/config/mosquitto.conf -v /mosquitto/data -v /mosquitto/log eclipse-mosquitto:<version>
+```
+:boom: if the mosquitto configuration (mosquitto.conf) was modified
+to use non-default ports, the docker run command will need to be updated
+to expose the ports that have been configured.

docker/from_dist/docker-entrypoint.sh

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+#!/bin/ash
+set -e
+
+exec "$@"