edd10c12f7
As we don't need to setup data directories from ExecStartPre= scripts anymore, which required root, but use systemd.tmpfiles.rules instead, everything can be run as just the mysql user.
To build the manual, you need Nix installed on your system (no need
for NixOS). To install Nix, follow the instructions at
https://nixos.org/nix/download.html
When you have Nix on your system, in the root directory of the project
(i.e., `nixpkgs`), run:
nix-build nixos/release.nix -A manual.x86_64-linux
When this command successfully finishes, it will tell you where the
manual got generated.