gitlabhq/gitlabhq — pull request #8458 by kfei (2014-12-17 06:53:23+00:00)
Title: Reduce the size of Docker image

1) Add `--no-install-recommends` option to `apt-get install`, this
avoids lots of (~30MB) unnecessary packages.
2) Add `ca-certificates` package for `wget` fetching stuffs from Amazon
S3.
3) There is no need to run `apt-get clean` for an image derived from
official Ubuntu since they already cleaned (see also:
http://goo.gl/B2SQRB) all the garbages produced by `apt-get`.

Signed-off-by: kfei