Add ability to push to remote repositories

Rubén Dávilarequested to merge
issue_116 into master

Closes #116 (closed)

Tasks:

  • Add ability to enter remote push URL under Mirror Repository settings
  • Add implementation code to push to remote repository
  • Add new background worker
  • Show latest update date and sync errors if they exists.
  • Write specs.
  • Sync remote mirror every hour.

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