automatically sync the list of repositories to sync to github

Our own repos are automatically synced to our code mirror on github if they're tagged with the right tag. But freshly tagged repos are not automatically added there and, I suppose, freshly untagged repos remain there. We should automate these steps, to avoid the periodic appearance of issues like swh/devel/swh-docs#824.

Migrated from T825 (view on Phabricator)

Edited Jan 08, 2023 by Phabricator Migration user

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automatically sync the *list* of repositories to sync to github

automatically sync the list of repositories to sync to github