Add Rsync URLs

intrigerirequested to merge
tails-18263-mirrorbits into master

This change adds:

  • A non-required "rsync_url" property for mirrors,

  • Rsync URLs for mirrors that currently provide Rsync and publicly list the Tails data.

This is needed for the deployment of Mirrorbits.

refs tails#18263 (closed)

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