Brief approximation:

• Check that SVN compiles and runs on Linux
• Check that SVN compiles and runs on Linux with --without-pch
• Check that SVN compiles and runs on Windows
• Check that SVN compiles and runs on OS X
• Run Windows autobuilder
• Update public trunk checkout
• Ensure it is clean (svn st --no-ignore)
• Run source/tools/dist/build.sh
• Test on Windows:
  • Delete %appdata%\0ad\cache
  • Extract release
  • Run pyrogenesis.exe, check everything seems to work
  • Run Atlas.bat, check everything seems to work
  • Delete %appdata%\0ad\cache
  • Build Debug version, check everything seems to work
  • Run test project
• Test on Linux:
  • Delete ~/.cache/0ad
  • Extract release
  • Build, test_dbg, run game, run editor
  • CONFIG=Release build, test, run game, run editor
• Test on OS X:
  • Update MacPorts
  • Same as Linux (but editor won't work)
• Update ​Gentoo package:
  • Bump version number
  • FEATURES=test emerge 0ad
  • Upload to Bugzilla
• On error goto beginning
• Upload releases to server
• Verify sha1sums on server
• Update LatestRelease page (all links and checksums)
• Announce release
• ?
• Profit