Sanity checks for 0.12.0 - respin #1

Please do sanity checks according to steps below:

1. Please, get the tarball and check it, run tests.
   tarball: https://gitlab.isc.org/isc-projects/stork/-/jobs/1211091/artifacts/browse
2. Start demo locally (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. in VMs from binary packages:
   debs: https://gitlab.isc.org/isc-projects/stork/-/jobs/1211092/artifacts/browse
   rpms: https://gitlab.isc.org/isc-projects/stork/-/jobs/1211093/artifacts/browse