Integrate core-services-01 in a nice workflow (#1)

This enables the tracking of core-services-01 over the infrastructure repository.

Co-authored-by: Gabriel DORIATH DOHLER <gabriel.doriath.dohler@ens.psl.eu>
Reviewed-on: https://git.rz.ens.wtf/Klub-RZ/infrastructure/pulls/1
Co-authored-by: raito <raito@noreply.git.rz.ens.wtf>
Co-committed-by: raito <raito@noreply.git.rz.ens.wtf>

machines/core-services-01/vim.nix

@@ -0,0 +1,31 @@
+{ pkgs, ... }:
+{
+  environment.variables = { EDITOR = "vim"; };
+
+  environment.systemPackages = with pkgs; [
+    nixfmt
+    git
+    (neovim.override {
+      vimAlias = true;
+      configure = {
+        packages.myPlugins = with pkgs.vimPlugins; {
+          start = [ vim-lastplace vim-nix ];
+          opt = [];
+        };
+        customRC = ''
+          set encoding=utf-8
+          set wildmenu
+
+          set nocompatible
+          set backspace=indent,eol,start
+          set cursorline
+          hi CursorLine term=bold cterm=bold ctermbg=darkgrey
+          set number
+          set relativenumber
+          set tabstop=4
+          set expandtab
+        '';
+      };
+    }
+  )];
+}