Update to Debian Stretch and Alpine 3.6, removing erlang-solutions

The erlang-solutions repository was used back in 2015 to get us a newer version of Erlang on our then Wheezy-based image -- now that Stretch is stable and ready, we can get 19.x directly from Debian, and thus get multiarchitecture builds as well without additional effort (since the `rabbitmq-server` package is `arch:all`).

Author: tianon

3.6/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.5
+FROM alpine:3.6
 
 # add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
 RUN addgroup -S rabbitmq && adduser -S -h /var/lib/rabbitmq -G rabbitmq rabbitmq
@@ -54,7 +54,7 @@ RUN set -ex; \
 	export GNUPGHOME="$(mktemp -d)"; \
 	gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$GPG_KEY"; \
 	gpg --batch --verify rabbitmq-server.tar.xz.asc rabbitmq-server.tar.xz; \
-	rm -r "$GNUPGHOME" rabbitmq-server.tar.xz.asc; \
+	rm -rf "$GNUPGHOME" rabbitmq-server.tar.xz.asc; \
 	\
 	mkdir -p "$RABBITMQ_HOME"; \
 	tar \

3.6/debian/Dockerfile

@@ -1,35 +1,30 @@
-FROM debian:jessie
+FROM debian:stretch-slim
+
+RUN set -ex; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends \
+		gnupg2 \
+		dirmngr \
+	; \
+	rm -rf /var/lib/apt/lists/*
 
 # add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
 RUN groupadd -r rabbitmq && useradd -r -d /var/lib/rabbitmq -m -g rabbitmq rabbitmq
 
 # grab gosu for easy step-down from root
-ENV GOSU_VERSION 1.7
+ENV GOSU_VERSION 1.10
 RUN set -x \
 	&& apt-get update && apt-get install -y --no-install-recommends ca-certificates wget && rm -rf /var/lib/apt/lists/* \
 	&& wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture)" \
 	&& wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture).asc" \
 	&& export GNUPGHOME="$(mktemp -d)" \
 	&& gpg --keyserver ha.pool.sks-keyservers.net --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4 \
 	&& gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu \
-	&& rm -r "$GNUPGHOME" /usr/local/bin/gosu.asc \
+	&& rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc \
 	&& chmod +x /usr/local/bin/gosu \
 	&& gosu nobody true \
 	&& apt-get purge -y --auto-remove ca-certificates wget
 
-# Add the officially endorsed Erlang debian repository:
-# See:
-#  - http://www.erlang.org/download.html
-#  - https://www.erlang-solutions.com/resources/download.html
-RUN set -ex; \
-	key='434975BD900CCBE4F7EE1B1ED208507CA14F4FCA'; \
-	export GNUPGHOME="$(mktemp -d)"; \
-	gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
-	gpg --export "$key" > /etc/apt/trusted.gpg.d/erlang-solutions.gpg; \
-	rm -r "$GNUPGHOME"; \
-	apt-key list
-RUN echo 'deb http://packages.erlang-solutions.com/debian jessie contrib' > /etc/apt/sources.list.d/erlang.list
-
 # install Erlang
 RUN apt-get update \
 	&& apt-get install -y --no-install-recommends \
@@ -57,7 +52,7 @@ RUN set -ex; \
 	export GNUPGHOME="$(mktemp -d)"; \
 	gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
 	gpg --export "$key" > /etc/apt/trusted.gpg.d/rabbitmq.gpg; \
-	rm -r "$GNUPGHOME"; \
+	rm -rf "$GNUPGHOME"; \
 	apt-key list
 RUN echo 'deb http://www.rabbitmq.com/debian testing main' > /etc/apt/sources.list.d/rabbitmq.list