v0.15.13 release checklist

[alerque]

Previous: release v0.15.12, checklist #2266.

• Shuffle any issues being put off to future milestones
• Close all issues in current milestone (except this one)
• Spring clean
  • Re-fetch tooling
• Configure and build
• Pass all tests
  • Remote CI
  • Local
• Cut release
• Push release commit & tag to master
• Download release artifacts, GPG sign, and upload signatures
• Publish release build to craties.io
• Publish rusile library to craties.io
• Update website
  • Copy and post manual, update 'latest' symlink and menu links
  • Copy changelog and prefix with a summary as a blog post
  • Tweak summary for gfm and edit into GitHub release notes
• Update downstream distro packages
  • Arch Linux: extra/sile
  • Homebrew: Formula – pull request
  • NixOS: nixpkgs – pull request – tracker
    • Drop devel flag from any website examples that were using it
  • Ubuntu: ppa
  • Docker Hub: tags
  • GHCR: versions
  • openSUSE:
  • Fedora:
  • NetBSD:
  • Void Linux: – template – pull request
  • OpenBSD:
• Bump downstream projects
  • FontProof (Docker image base plus CI matrix)
  • CaSILE (check, consider patch release)
• Eat cake

This release