Demo mode not working

[stweil]

Describe the bug

The demo mode does not work.
It complains about a missing directory modules in the source root directory
and does not allow a connection to localhost:8080.

Starting ElasticSearch server ...
Starting Database server ...
[DEBUG] 2024-12-02 17:18:24.132 [org.kitodo.demo.KitodoEnvironmentBuilder.main()] Config - Using configuration from kitodo_config.properties
[ERROR] 2024-12-02 17:18:25.852 [org.kitodo.demo.KitodoEnvironmentBuilder.main()] KitodoServiceLoader - Specified module folder does not exist: /root/kitodo-production/modules
[ERROR] 2024-12-02 17:18:25.855 [org.kitodo.demo.KitodoEnvironmentBuilder.main()] KitodoServiceLoader - Couldn't find a module for interface org.kitodo.api.filemanagement.FileManagementInterface!

After an mkdir modules and a new start the initial page ("Sign in") works,
but a valid authentication with testadmin / test hangs minutes before the sign in page is shown again.

To Reproduce
Steps to reproduce the behavior follow the documentation in the Wiki:

1. Install documented requirements (apt install git maven openjdk-11-jdk-headless).
2. Clone repository kitodo-production.
3. Run mvn clean install '-Pdemo,!development' in the newly cloned directory.
4. Try to connect a web browser (or curl / wget) to http://localhost:8080/ and see error.

Expected behavior
The demo mode should work.

Release
Recent Git master branch.