General QoL and package updates

[GAsplund]

Key Features

• Update a lot of packages
  • Add compatibility with updated packages
  • Addresses some security issues
• Add a CODEOWNERS file
• Optimize the Dockerfile for faster sequential builds by placing most commonly edited stages further down
• Use Docker build cache between builds
• Run database migrations on each startup
• Compose file for running a local version of Gamma (mainly for testing with INFO keys)

Known Issues

• The image size is bigger :(

[Oscariremma]

LGTM