This playbook
- Installs Gecko dependencies
- Clones & builds ava-build/gecko
- Creates an ava user
- Installs Gecko in /usr/bin
- Creates and installs a staking certificate
- Installs Gecko as a Systemd service called "ava"
- Configures /var/lib/ava/db as the database
- Configures /var/log/ava as the log destination
- Starts the service