Updated Dockerfile.release to build 0.23.0:

waj · waj · commit 158a818ed431 · 2017-07-07T11:42:48.000-03:00
- Use ubuntu:xenial as base image
 - Obtain keys from keyserver.ubuntu.com (keys.gnupg.net server times out really often)
diff --git a/Dockerfile.release b/Dockerfile.release
@@ -1,9 +1,9 @@
-FROM ubuntu:14.04
+FROM ubuntu:xenial
 
 RUN \
   apt-get update && \
   apt-get install -y apt-transport-https && \
-  apt-key adv --keyserver keys.gnupg.net --recv-keys 09617FD37CC06B54 && \
+  apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 09617FD37CC06B54 && \
   echo "deb https://dist.crystal-lang.org/apt crystal main" > /etc/apt/sources.list.d/crystal.list && \
   apt-get update && \
   apt-get install -y crystal gcc pkg-config libssl-dev libxml2-dev libyaml-dev libgmp-dev git make && \
