[GRASS-git] [OSGeo/grass] d8ce5b: change to alpine version 3.12 (#711)

[AnikaBettge]

  Branch: refs/heads/releasebranch_7_8
  Home:   https://github.com/OSGeo/grass
  Commit: d8ce5b0c40304ed6a64ddccef879e0a1430bb7b9
      https://github.com/OSGeo/grass/commit/d8ce5b0c40304ed6a64ddccef879e0a1430bb7b9
  Author: AnikaBettge <37300249+AnikaBettge at users.noreply.github.com>
  Date:   2020-06-17 (Wed, 17 Jun 2020)

  Changed paths:
    M docker/alpine/Dockerfile_alpine

  Log Message:
  -----------
  change to alpine version 3.12 (#711)