From Docker
You can get the official image from the docker repository :
docker pull maif/izanami
AND then run it
docker run -p "8080:8080" -e "FILTER_CLAIM_SHAREDKEY=averyrandomandsecretvalue" maif/izanami:1.11.5
you can also provide some ENV variable using the --env flag to customize your Izanami instance. Check the configuration documentation here