Dockerfile: Fix checked-out branch
As is your dockerfile pulls the latest development branch, rather
than the last stable release. This patch:

  - adds an environment variable which can be used to easily change
    the pulled version (specifiying the tagged release)
  - Adds the command to `git checkout tags/<tag>`

Signed-off-by: Mark <mark@stengle.in>
1 parent 0f3baa7 commit b8accf3de0c5ef21236a53467ab2bf2f336ccfdb
@Mark Mark authored on 3 Apr 2018
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