[GRASS-git] [OSGeo/grass] ee9029: Dockerfiles: install git before build (#990)

[mmacata]

  Branch: refs/heads/releasebranch_7_8
  Home:   https://github.com/OSGeo/grass
  Commit: ee902923c7ec3eea8477313ed070053a3f96596d
      https://github.com/OSGeo/grass/commit/ee902923c7ec3eea8477313ed070053a3f96596d
  Author: mmacata <mmacata at users.noreply.github.com>
  Date:   2020-09-25 (Fri, 25 Sep 2020)

  Changed paths:
    M docker/alpine/Dockerfile_alpine
    M docker/alpine/Dockerfile_alpine_wxgui

  Log Message:
  -----------
  Dockerfiles: install git before build (#990)