Image refactor

[developeregrem]

• Moved php and nginx images to fewohbee main repo to increase maintainability.
• Switched from dockerhub to GHCR
• Uploaded images are now stored in dedicated named volumes (uploads-export, uploads-roomcat)
  • a migration container runs on startup to migrate uploaded images to the new place
• optimized update-docker.sh to be more robust
• new images pin a specific version and fewohbee is prebuild and all vendor libs are loadd already which will speed up startup process after updates