Publish built html pages automatically

This needs the protected variables

   - RSYNC_TARGET: remote host and folder
   - SSH_USER: ssh user to log in as
   - SSH_PORT: sshd port on the remote side
   - SSH_KEY: ssh private key
   - SSH_HOST_KEY: ssh host key of target gathered via e.g. ssh-keyscan

filled in to work

Closes: #14
1 job for publish-automatically in 10 minutes and 48 seconds
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