tree 55b3f55aa153afe25746ccb2dabfc22a32af00c8
parent f6adb282f88ab56afa3ef33b15d7acaf4b307eef
author Ivan Kelly <ivank@apache.org> 1554121189 +0200
committer Ivan Kelly <ivank@apache.org> 1554121763 +0200

Docker autobuild hook

This hook will allow docker autobuild to build from the offical tag
and removes the need to update the dockerfile after the release has
been made.

It also adds a build arg, DISTRO_URL which can be used for testing
release candidates.

```
docker build --build-arg BK_VERSION=4.9.1
    --build-arg DISTRO_URL=<rc-tarball-url> .
```

Reviewers: Enrico Olivelli <eolivelli@gmail.com>, Sijie Guo <sijie@apache.org>

This closes #2017 from ivankelly/docker-tag2
(cherry picked from commit 4573285db9e027416bf33ab9b959b952d2b0e8d5)

Signed-off-by: Ivan Kelly <ivank@apache.org>