Harvesting Gitlab Integration

Add the ability to harvest data from Gitlab.

Data that could be harvested

/api/v4/..

• /projects/:id
  • forks_count
  • star_count
  • license (with ?license=true)
• /projects/:id/forks
  • list forks of a project
• /projects/:id/repository/commits
  • list of all commits
• /projects/:id/releases
  • list with releases
• project statistics shows only HTTP fetches and require write access to the repository

Requirements

• allow multiple gitlab instances
• add gitlab support in filter_zenodo_data_versioned_dois() in harvesting/releases.py

Data to be harvested

We should discuss this list and enhance it if possible

• commits
• number of forks (not harvested for github?)
• number of stars (not harvested for github?)