Multiple fixes for z-push

• Use our own repo for z-push, with few new fixes:
  • Reject 401
  • z-push!1 (diffs)
• Pull over ssh instead of http, to allow to keep a private repo
• Install CERN CA in base image
• Update documentation

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• 6cb8587d - Update documentation:

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• 43eaeb26 - Update documentation:

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• 3581a620 - Z-push: CalDav: add workaround for OX bad ETags

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• c56d1af8 - Z-push: CalDav: add workaround for OX bad ETags

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Manually merged, except for the bad ETag handling

closed