Setup user permissions for the bzr-sync server

bzr-sync user permissions.sh

sudo adduser bzr-sync          # Create new bzr-sync user
sudo su bzr-sync               # Change to bzr-sync user
ssh-keygen                     # Create new RSA key
cat ~/.ssh/id_rsa.pub          # Add this public key to Github and Launchpad
# Now check we can clone your github projects properly
git clone git@github.com:example/example-project
rm -r example-project          # Once we've tested this, delete the project again
# And check we can branch and push to launchpad projects
bzr branch lp:example-project  # Branch a project
cd example-project             # Change to its directory
bzr push :parent               # Check pushing works
rm example-project             # Cleanup