v2.1.0

• Use GitHub Actions for building and publishing
• Renew Docker image
• Multi-Arch Docker images
• Add Images to Github-Container-Registry
• Server-side password handling
• dark theme
• Update app dependencies
• Add/Update translations:
  • japanese
  • dutch
  • polish
  • russian
  • swedish
  • spanish
• Fix: tar.gz download consumes much memory

Full Changelog: v2.0.1...v2.1.0

docker pull ghcr.io/psi-4ward/psitransfer:v2.1.0