Update Dockerfile

ejabberd-mix/Dockerfile

@@ -1,10 +1,17 @@
 FROM alpine:3.4
 MAINTAINER ProcessOne <contact@process-one.net>
 
-# Install elixir from apk
-RUN apk --update add build-base git zlib-dev openssl-dev yaml-dev expat-dev \
+RUN echo \
+  # Replacing default repositories with edge ones as we need Elixir 1.3.x
+  # Previous version of Elixir do not handle our deps properly
+  && echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" > /etc/apk/repositories \
+  && echo "http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories \
+  && echo "http://dl-cdn.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories && \
+
+  # Install elixir from apk
+  apk add --no-cache build-base git zlib-dev openssl-dev yaml-dev expat-dev \
    elixir erlang-crypto erlang-syntax-tools erlang-parsetools \
-   erlang-eunit erlang-mnesia && rm -rf /var/cache/apk/*
+   erlang-eunit erlang-mnesia
 
 # Install Hex+Rebar
 RUN mix local.hex --force && \