fix volume permission error

[NicoFgrx]

Hi,

This PR fix an error about volume permission at docker startup :
Before:

docker compose up
[+] Running 6/6
 ✔ Network osaka_net                  Created                                                                                                                              0.1s 
 ✔ Container osaka-database-1         Created                                                                                                                              0.1s 
 ✔ Container osaka-loader-1           Created                                                                                                                              0.1s 
 ✔ Container osaka-editor-1           Created                                                                                                                              0.1s 
 ✔ Container osaka-visualizer-1       Created                                                                                                                              0.1s 
 ✔ Container osaka-volume-perm-job-1  Created                                                                                                                              0.1s 
Attaching to database-1, editor-1, loader-1, visualizer-1, volume-perm-job-1
visualizer-1       | /docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
visualizer-1       | /docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
visualizer-1       | /docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
visualizer-1       | 10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
Error response from daemon: error while creating mount source path '/opt/db': mkdir /opt/db: read-only file system

After: containers starts correctly :)

The volumes section inside the compose declares an unused volume, so I assumed it was this one.

Also, if you follow the documentation the zip archives will be generated inside tools folder so I add it in the .gitignore file