Restrict pushes / merges to a protected branch to specific groups

Parent: gitlab-org/gitlab-ee#179

Proposal

• According to current / planned features in CE, here's the list of possible restrictions for pushing/merging to a protected branch:

  • Masters can push
  • Developers can push
  • No one can push
  • Masters can merge
  • Developers can merge

• To this list, this issue proposes adding the ability to add restrictions based on one or more specific groups:

  • "Group A, B & C" can push (and no one else, regardless of Master status)
  • "Group A, B & C" can merge (and no one else, regardless of Master status)

Implementation Details

• any group can be set
• the group should automatically have this project shared with it (using the 'share with group' feature)
• should be communicated in the UI