installation-cd-graphical-base.nix: adding git (#79098)

Changed files
+3
nixos
modules
+3
nixos/modules/installer/cd-dvd/installation-cd-graphical-base.nix
···
pkgs.bvi # binary editor
pkgs.joe
+
# Include some version control tools.
+
pkgs.git
+
# Firefox for reading the manual.
pkgs.firefox