Generate code with codegen

This should finally work now
```
npm install @openapitools/openapi-generator-cli -g
openapi-generator-cli generate \
    -i [URL_TO_OUT_SPEC] \
    -g kotlin \
    -o /tmp/test/ \
    --global-property models \
    --additional-properties=library=multiplatform,packageName=com.ioki.passenger.api
```

