Cleanup of application setup scripts like also improved docker entrypoint to better support error handling

• SQL roles setup cleanup: whole setup is performed by haf_admin role. hafah_owner role is explicitly set as execution role in all sql files requiring it (to avoid errors while manual application installation etc).
• Improved docker entrypoint to support install_app/uninstall_app/app service startup. So the default application image can serve as setup image like also as a application service (embedded PostgREST)
• Reduced image size to c.a. 35MB
• Cleaned up obsolete scripts related to removed Python implementation

Requires common-ci-configuration!38 (merged)