!Update default dockerBaseImage to official repo

[danielwegener]

according to https://blog.docker.com/2015/03/updates-available-to-popular-repos-update-your-images/, all dockerfile/* repos will be replaced with an official repository. This may be a better default configuration.

[muuki88]

Awesome, thanks. Where you able to run the tests? sbt "scripted docker/*"

[muuki88]

Note: Reading the comments on the docker repo, it seems like only open-jdk is supported. However updating is reasonable IMHO

[danielwegener]

This was just a ping as I stumbled across the blog post. The PR comes from the github ui and I have not yet tried to sbt-native-packager at all :)
But I can try it later in the evening.

[muuki88]

Ah, github is amazing :)

I tested this on my machine with docker 1.5 and everything works fine

[muuki88]

Thanks :)

[danielwegener]

Awesome :)

[dhpiggott]

Does the base image need to include a JDK? I've been using just the JRE image without any problems, but I note that the 'latest' tag of the new official Docker repo (https://registry.hub.docker.com/_/java/) is an alias for openjdk-7-jdk (https://github.com/docker-library/java/blob/4c5beb8bdb21c746bef683f18bdeddee157f61fd/openjdk-7-jdk/Dockerfile), whereas the 'latest' tag of the old Dockerfile repo (https://registry.hub.docker.com/u/dockerfile/java/) was an alias for openjdk-7-jre.

Might it be worth changing it to the 'jre' version, which is an alias for https://github.com/docker-library/java/blob/4c5beb8bdb21c746bef683f18bdeddee157f61fd/openjdk-7-jre/Dockerfile?