More than one database creation with env.variables

Could I create more than one database with the help of env.variables.
Ex.:
```
docker run --rm -e INFLUXDB_DB=db0 -e INFLUXDB_DB=db1 influxdb /init-influxdb.sh
```
In this case only the last one will be created, how can I create both of them

Start by reading the repository's Docker initialization flow and the `/init-influxdb.sh` entry point mentioned in the issue. Determine how `INFLUXDB_DB` is parsed and define how multiple database values should be supplied; done means both `db0` and `db1` are created during container initialization.

Written by the indexing model from the issue text.