v0.17.4 Release

Includes

• Some DB optimizations.
  • The DB upgrade should take ~30 minutes for servers with a lot of content. Be patient.
• Fixes for a few security vulnerabilities.
• Full Release notes to come with next major version release.

Upgrade notes

• lemmy-ansible upgrade instructions.
• For docker, changes the image tags to dessalines/lemmy-ui:0.17.4 and dessalines/lemmy:0.17.4