hydra-module: Don't rely on su being available.

Dependencies

• [2] V4R3SIRM hydra-module.nix: Don't use a password
• [3] F3M47DHJ hydra-module.nix: More paranoid permissions on the data directory
• [4] 7XOH2DGH hydra-module.nix: Give types to options
• [5] KMPLMG7T hydra-module.nix: Cleanup
• [6] ZYEFL36Q Ported/merged properties from the TUD configuration's hydra-module
• [7] D3MDJONY
• [8] T4DBPQOF hydra-module: Run hydra-init during hydra-init.service
• [9] ASPNI2AO hydra-module.nix: Automatically create postgres db user for hydra and an admin hydra account

Change contents

• replacement in hydra-module.nix at line 187
  [4.99]→[4.907:927](∅→∅),[4.907]→[4.907:927](∅→∅)
  − script = ''
  [4.99]

  [3.0]
  + preStart = ''
• edit in hydra-module.nix at line 198
  [2.407]→[4.655:726](∅→∅),[4.697]→[4.655:726](∅→∅)
  − ${pkgs.shadow}/bin/su hydra -c ${cfg.package}/bin/hydra-init
• edit in hydra-module.nix at line 199
  [4.3899]

  [4.265]
  + serviceConfig.ExecStart = "${cfg.package}/bin/hydra-init";

  + serviceConfig.User = "hydra";