We are using wp-cli-fixtures for fixtures.
./bin/docker/wp package install git@github.com:nlemoine/wp-cli-fixtures.git
Fixtures can be added to ./fixtures.yml
see readme of wp-cli-fixtures for more info.
Fixtures can be loaded with the following command:
./bin/docker/wp fixtures load
If you wish to delete fixtures you've previously loaded, you can do so via:
./bin/docker/wp fixtures delete