Switch to multi-stage builds

[timothyb89]

Docker now supports multi-stage builds: https://docs.docker.com/engine/userguide/eng-image/multistage-build/#use-multi-stage-builds

These would be a much better alternative to our ARG trickery.

[kornicameister]

I already done something similar here.
Might not be helpful at the moment, but I believe this might be a nice reference.

[kornicameister]

@timothyb89 in order to make it happen in CI, I think you'd need to update docker there. In #121 I am trying to submit kibana image that is using multi-stage feature, but seems like from keyword for COPY operation is unknown.

[timothyb89]

Ah, good point, I'll look into updating docker in Travis

…

On Wed, Jul 19, 2017, 4:21 AM Tomasz Trębski ***@***.***> wrote: @timothyb89 <https://github.com/timothyb89> in order to make it happen in CI, I think you'd need to update docker there. In #121 <#121> I am trying to submit kibana image that is using multi-stage feature, but seems like from keyword for COPY operation is unknown. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#80 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ADTLcra3QMsg1Sz1UQA3jpgvKJ1fa-ELks5sPdiugaJpZM4N13ie> .

[timothyb89]

For reference later, Travis has a document for upgrading... https://docs.travis-ci.com/user/docker/#Installing-a-newer-Docker-version