Pacman installation notes
The pacman package contains a dependency to package libappindicator-sharp, which is no longer distributed with Arch Linux. I cannot remove this dependency for now, because it is an issue in electron-builder (the packaging tool which is used in this project). It is, however, possible to install Dopamine on Arch Linux or Manjaro using this command:
$ sudo pacman -U Dopamine-3.0.0-preview.1.pacman --assume-installed libappindicator-sharp