Sanity checks for 0.13.0 release

Please do your sanity checks according to the steps below:

1. Download the tarball, verify it is sane, build it and run tests.
   Tarball: https://gitlab.isc.org/isc-projects/stork/-/jobs/1272748/artifacts/browse
2. Start the demo with rake docker_up and follow the steps from: https://gitlab.isc.org/isc-projects/stork/-/wikis/Demo
3. Install server and agent locally e.g. on VMs from the binary packages:
   debs: https://gitlab.isc.org/isc-projects/stork/-/jobs/1272749/artifacts/browse
   rpms: https://gitlab.isc.org/isc-projects/stork/-/jobs/1272750/artifacts/browse